CSci 127: Introduction to Computer Science
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1 CSci 127: Introduction to Computer Science hunter.cuny.edu/csci CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
2 Lecture Slip: tinyurl.com/yb8lcvl7 CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
3 Frequently Asked Questions From lecture slips & recitation sections. Why did you reorganize the lab, 1001E? CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
4 Frequently Asked Questions From lecture slips & recitation sections. Why did you reorganize the lab, 1001E? Lab serves dual purposes: recitation and drop-in tutoring. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
5 Frequently Asked Questions From lecture slips & recitation sections. Why did you reorganize the lab, 1001E? Lab serves dual purposes: recitation and drop-in tutoring. Having the teachers desk in front of the door was bad for both: CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
6 Frequently Asked Questions From lecture slips & recitation sections. Why did you reorganize the lab, 1001E? Lab serves dual purposes: recitation and drop-in tutoring. Having the teachers desk in front of the door was bad for both: It was difficult to lecture with folks walking in front of screen, and CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
7 Frequently Asked Questions From lecture slips & recitation sections. Why did you reorganize the lab, 1001E? Lab serves dual purposes: recitation and drop-in tutoring. Having the teachers desk in front of the door was bad for both: It was difficult to lecture with folks walking in front of screen, and it was difficult for tutoring during quiz & lecture. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
8 Frequently Asked Questions From lecture slips & recitation sections. Why did you reorganize the lab, 1001E? Lab serves dual purposes: recitation and drop-in tutoring. Having the teachers desk in front of the door was bad for both: It was difficult to lecture with folks walking in front of screen, and it was difficult for tutoring during quiz & lecture. Why do I need to sign in when dropping in? CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
9 Frequently Asked Questions From lecture slips & recitation sections. Why did you reorganize the lab, 1001E? Lab serves dual purposes: recitation and drop-in tutoring. Having the teachers desk in front of the door was bad for both: It was difficult to lecture with folks walking in front of screen, and it was difficult for tutoring during quiz & lecture. Why do I need to sign in when dropping in? Our current space is temporary. We re collecting data to bolster our case for more space (& more tutors)! CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
10 Frequently Asked Questions From lecture slips & recitation sections. Why did you reorganize the lab, 1001E? Lab serves dual purposes: recitation and drop-in tutoring. Having the teachers desk in front of the door was bad for both: It was difficult to lecture with folks walking in front of screen, and it was difficult for tutoring during quiz & lecture. Why do I need to sign in when dropping in? Our current space is temporary. We re collecting data to bolster our case for more space (& more tutors)! Why can t in-class quizzes taken at midnight count towards my grade? CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
11 Frequently Asked Questions From lecture slips & recitation sections. Why did you reorganize the lab, 1001E? Lab serves dual purposes: recitation and drop-in tutoring. Having the teachers desk in front of the door was bad for both: It was difficult to lecture with folks walking in front of screen, and it was difficult for tutoring during quiz & lecture. Why do I need to sign in when dropping in? Our current space is temporary. We re collecting data to bolster our case for more space (& more tutors)! Why can t in-class quizzes taken at midnight count towards my grade? The in-class quizzes are in place of midterm exams. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
12 Frequently Asked Questions From lecture slips & recitation sections. Why did you reorganize the lab, 1001E? Lab serves dual purposes: recitation and drop-in tutoring. Having the teachers desk in front of the door was bad for both: It was difficult to lecture with folks walking in front of screen, and it was difficult for tutoring during quiz & lecture. Why do I need to sign in when dropping in? Our current space is temporary. We re collecting data to bolster our case for more space (& more tutors)! Why can t in-class quizzes taken at midnight count towards my grade? The in-class quizzes are in place of midterm exams. We want to know that you (and not friend/family) took the in-class quiz. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
13 Frequently Asked Questions From lecture slips & recitation sections. Why did you reorganize the lab, 1001E? Lab serves dual purposes: recitation and drop-in tutoring. Having the teachers desk in front of the door was bad for both: It was difficult to lecture with folks walking in front of screen, and it was difficult for tutoring during quiz & lecture. Why do I need to sign in when dropping in? Our current space is temporary. We re collecting data to bolster our case for more space (& more tutors)! Why can t in-class quizzes taken at midnight count towards my grade? The in-class quizzes are in place of midterm exams. We want to know that you (and not friend/family) took the in-class quiz. What s my grade in the class? CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
14 Frequently Asked Questions From lecture slips & recitation sections. Why did you reorganize the lab, 1001E? Lab serves dual purposes: recitation and drop-in tutoring. Having the teachers desk in front of the door was bad for both: It was difficult to lecture with folks walking in front of screen, and it was difficult for tutoring during quiz & lecture. Why do I need to sign in when dropping in? Our current space is temporary. We re collecting data to bolster our case for more space (& more tutors)! Why can t in-class quizzes taken at midnight count towards my grade? The in-class quizzes are in place of midterm exams. We want to know that you (and not friend/family) took the in-class quiz. What s my grade in the class? Easy estimate: 30% Programs (drop 5 lowest), 30% Quizzes (drop 2 lowest)* Of first 40: missed 8 or less, have > 90% For in-class quizzes: drop 2 (or replace 5 with final grade). CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
15 Today s Topics Recap of Python & Circuits High vs. Low-Level Programming A Simplified Machine Language Final Exam Overview CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
16 Python & Circuits Review: 10 Weeks in 10 Minutes A whirlwind tour of the semester, so far... CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
17 Week 1: print(), loops, comments, & turtles CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
18 Week 1: print(), loops, comments, & turtles Introduced comments & print(): #Name: Thomas Hunter These lines are comments #Date: September 1, 2017 (for us, not computer to read) #This program prints: Hello, World! (this one also) print("hello, World!") Prints the string Hello, World! to the screen CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
19 Week 1: print(), loops, comments, & turtles Introduced comments & print(): #Name: Thomas Hunter These lines are comments #Date: September 1, 2017 (for us, not computer to read) #This program prints: Hello, World! (this one also) print("hello, World!") Prints the string Hello, World! to the screen As well as definite loops & the turtle package: CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
20 Week 2: variables, data types, more on loops & range() CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
21 Week 2: variables, data types, more on loops & range() A variable is a reserved memory location for storing a value. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
22 Week 2: variables, data types, more on loops & range() A variable is a reserved memory location for storing a value. Different kinds, or types, of values need different amounts of space: int: integer or whole numbers CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
23 Week 2: variables, data types, more on loops & range() A variable is a reserved memory location for storing a value. Different kinds, or types, of values need different amounts of space: int: integer or whole numbers float: floating point or real numbers CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
24 Week 2: variables, data types, more on loops & range() A variable is a reserved memory location for storing a value. Different kinds, or types, of values need different amounts of space: int: integer or whole numbers float: floating point or real numbers string: sequence of characters CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
25 Week 2: variables, data types, more on loops & range() A variable is a reserved memory location for storing a value. Different kinds, or types, of values need different amounts of space: int: integer or whole numbers float: floating point or real numbers string: sequence of characters list: a sequence of items CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
26 Week 2: variables, data types, more on loops & range() A variable is a reserved memory location for storing a value. Different kinds, or types, of values need different amounts of space: int: integer or whole numbers float: floating point or real numbers string: sequence of characters list: a sequence of items e.g. [3, 1, 4, 5, 9] or [ violet, purple, indigo ] CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
27 Week 2: variables, data types, more on loops & range() A variable is a reserved memory location for storing a value. Different kinds, or types, of values need different amounts of space: int: integer or whole numbers float: floating point or real numbers string: sequence of characters list: a sequence of items e.g. [3, 1, 4, 5, 9] or [ violet, purple, indigo ] class variables: for complex objects, like turtles. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
28 Week 2: variables, data types, more on loops & range() A variable is a reserved memory location for storing a value. Different kinds, or types, of values need different amounts of space: int: integer or whole numbers float: floating point or real numbers string: sequence of characters list: a sequence of items e.g. [3, 1, 4, 5, 9] or [ violet, purple, indigo ] class variables: for complex objects, like turtles. More on loops & ranges: CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
29 Week 3: colors, hex, slices, numpy & images CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
30 Week 3: colors, hex, slices, numpy & images CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
31 Week 3: colors, hex, slices, numpy & images CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
32 Week 4: design problem (cropping images) & decisions CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
33 Week 4: design problem (cropping images) & decisions First: specify inputs/outputs. Input file name, output file name, upper, lower, left, right ( bounding box ) CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
34 Week 4: design problem (cropping images) & decisions First: specify inputs/outputs. Input file name, output file name, upper, lower, left, right ( bounding box ) Next: write pseudocode. 1 Import numpy and pyplot. 2 Ask user for file names and dimensions for cropping. 3 Save input file to an array. 4 Copy the cropped portion to a new array. 5 Save the new array to the output file. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
35 Week 4: design problem (cropping images) & decisions First: specify inputs/outputs. Input file name, output file name, upper, lower, left, right ( bounding box ) Next: write pseudocode. 1 Import numpy and pyplot. 2 Ask user for file names and dimensions for cropping. 3 Save input file to an array. 4 Copy the cropped portion to a new array. 5 Save the new array to the output file. Next: translate to Python. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
36 Week 4: design problem (cropping images) & decisions CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
37 Week 5: logical operators, truth tables & logical circuits CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
38 Week 5: logical operators, truth tables & logical circuits in1 in2 returns: False and False False False and True False True and False False True and True True CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
39 Week 6: structured data, pandas, & more design nychistpop.csv In Lab 6 CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
40 Week 6: structured data, pandas, & more design import matplotlib.pyplot as plt import pandas as pd nychistpop.csv In Lab 6 CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
41 Week 6: structured data, pandas, & more design import matplotlib.pyplot as plt import pandas as pd pop = pd.read csv( nychistpop.csv,skiprows=5) nychistpop.csv In Lab 6 CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
42 Week 6: structured data, pandas, & more design import matplotlib.pyplot as plt import pandas as pd pop = pd.read csv( nychistpop.csv,skiprows=5) pop.plot(x="year") plt.show() nychistpop.csv In Lab 6 CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
43 Week 6: structured data, pandas, & more design import matplotlib.pyplot as plt import pandas as pd pop = pd.read csv( nychistpop.csv,skiprows=5) pop.plot(x="year") plt.show() nychistpop.csv In Lab 6 CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
44 Week 7: functions Functions are a way to break code into pieces, that can be easily reused. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
45 Week 7: functions Functions are a way to break code into pieces, that can be easily reused. Many languages require that all code must be organized with functions. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
46 Week 7: functions Functions are a way to break code into pieces, that can be easily reused. Many languages require that all code must be organized with functions. The opening function is often called main() CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
47 Week 7: functions Functions are a way to break code into pieces, that can be easily reused. Many languages require that all code must be organized with functions. The opening function is often called main() You call or invoke a function by typing its name, followed by any inputs, surrounded by parenthesis: CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
48 Week 7: functions Functions are a way to break code into pieces, that can be easily reused. Many languages require that all code must be organized with functions. The opening function is often called main() You call or invoke a function by typing its name, followed by any inputs, surrounded by parenthesis: Example: print("hello", "World") CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
49 Week 7: functions Functions are a way to break code into pieces, that can be easily reused. Many languages require that all code must be organized with functions. The opening function is often called main() You call or invoke a function by typing its name, followed by any inputs, surrounded by parenthesis: Example: print("hello", "World") Can write, or define your own functions, CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
50 Week 7: functions Functions are a way to break code into pieces, that can be easily reused. Many languages require that all code must be organized with functions. The opening function is often called main() You call or invoke a function by typing its name, followed by any inputs, surrounded by parenthesis: Example: print("hello", "World") Can write, or define your own functions, which are stored, until invoked or called. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
51 Week 8: function parameters, github Functions can have input parameters. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
52 Week 8: function parameters, github Functions can have input parameters. Surrounded by parenthesis, both in the function definition, and in the function call (invocation). CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
53 Week 8: function parameters, github Functions can have input parameters. Surrounded by parenthesis, both in the function definition, and in the function call (invocation). The placeholders in the function definition: formal parameters. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
54 Week 8: function parameters, github Functions can have input parameters. Surrounded by parenthesis, both in the function definition, and in the function call (invocation). The placeholders in the function definition: formal parameters. The ones in the function call: actual parameters CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
55 Week 8: function parameters, github Functions can have input parameters. Surrounded by parenthesis, both in the function definition, and in the function call (invocation). The placeholders in the function definition: formal parameters. The ones in the function call: actual parameters Functions can also return values to where it was called. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
56 Week 8: function parameters, github Functions can have input parameters. Surrounded by parenthesis, both in the function definition, and in the function call (invocation). The placeholders in the function definition: formal parameters. The ones in the function call: actual parameters. Functions can also return values to where it was called. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
57 Week 9: top-down design, folium CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
58 Week 10: indefinite loops, searching data, random() Indefinite (while) loops allow you to repeat a block of code as long as a condition holds. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
59 Week 10: indefinite loops, searching data, random() Indefinite (while) loops allow you to repeat a block of code as long as a condition holds. Very useful for checking user input for correctness. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
60 Week 10: indefinite loops, searching data, random() Indefinite (while) loops allow you to repeat a block of code as long as a condition holds. Very useful for checking user input for correctness. Python s built-in random package has useful methods for generating random whole numbers and real numbers. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
61 Week 10: indefinite loops, searching data, random() Indefinite (while) loops allow you to repeat a block of code as long as a condition holds. Very useful for checking user input for correctness. Python s built-in random package has useful methods for generating random whole numbers and real numbers. To use, must include: import random. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
62 Python & Circuits Review: 10 Weeks in 10 Minutes Input/Output (I/O): input() and print(); pandas for CSV files Types: Primitive: int, float, bool, string; Container: lists (but not dictionaries/hashes or tuples) Objects: turtles (used but did not design our own) Loops: definite & indefinite Conditionals: if-elif-else Logical Expressions & Circuits Functions: parameters & returns Packages: Built-in: turtle, math, random Popular: numpy, matplotlib, pandas, folium CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
63 Python & Circuits Review: 10 Weeks in 10 Minutes A whirlwind tour with 10 (or so) challenges... CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
64 In Pairs or Triples: Week 1 Predict what the code will do: CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
65 In Pairs or Triples: Week 2 Predict what the code will do: CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
66 In Pairs or Triples: Week 3 Predict what the code will do: CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
67 In Pairs or Triples: Week 4 Extend this program to also allow drawing in purple & stamping: CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
68 In Pairs or Triples: Week 5 When does this circuit yield true? That is, what values for the inputs give an output value of true? CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
69 In Pairs or Triples: Week 6 Predict what the following will do: print("queens:", pop["queens"].min()) print("s I:", pop["staten Island"].mean()) print("s I:", pop["staten Island"].std()) pop.plot.bar(x="year") pop.plot.scatter(x="brooklyn", y= "Total") pop["fraction"] = pop["bronx"]/pop["total"] CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
70 In Pairs or Triples: Week 7 Fill in the function body: CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
71 In Pairs or Triples: Week 8 What are the formal parameters for the functions? What is the output of: r = foo([1,2,3,4]) print("return: ", r) What is the output of: r = foo([1024,512,256,128]) print("return: ", r) CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
72 In Pairs or Triples: Week 9 What does this code do? CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
73 In Pairs or Triples: Week 10 Predict what the code will do: Write a function that asks a user for number after 2000 but before The function should repeatedly ask the user for a number until they enter one within the range and return the number. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
74 Python & Circuits Review: 10 Weeks in 10 Minutes Input/Output (I/O): input() and print(); pandas for CSV files Types: Primitive: int, float, bool, string; Container: lists (but not dictionaries/hashes or tuples) Objects: turtles (used but did not design our own) Loops: definite & indefinite Conditionals: if-elif-else Logical Expressions & Circuits Functions: parameters & returns Packages: Built-in: turtle, math, random Popular: numpy, matplotlib, pandas, folium CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
75 High-Level vs. Low-Level Languages (codecommit) Can view programming languages on a continuum. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
76 High-Level vs. Low-Level Languages (codecommit) Can view programming languages on a continuum. Those that directly access machine instructions & memory and have little abstraction are low-level languages CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
77 High-Level vs. Low-Level Languages (codecommit) Can view programming languages on a continuum. Those that directly access machine instructions & memory and have little abstraction are low-level languages (e.g. machine language, assembly language). CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
78 High-Level vs. Low-Level Languages (codecommit) Can view programming languages on a continuum. Those that directly access machine instructions & memory and have little abstraction are low-level languages (e.g. machine language, assembly language). Those that have strong abstraction (allow programming paradigms independent of the machine details, such as complex variables, functions and looping that do not translate directly into machine code) are called high-level languages. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
79 High-Level vs. Low-Level Languages (codecommit) Can view programming languages on a continuum. Those that directly access machine instructions & memory and have little abstraction are low-level languages (e.g. machine language, assembly language). Those that have strong abstraction (allow programming paradigms independent of the machine details, such as complex variables, functions and looping that do not translate directly into machine code) are called high-level languages. Some languages, like C, are in between allowing both low level access and high level data structures. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
80 Machine Language (Ruth Gordon & Ester Gerston programming the ENIAC, UPenn) CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
81 Machine Language (wiki) CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
82 Machine Language We will be writing programs in a simplified machine language, WeMIPS. (wiki) CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
83 Machine Language We will be writing programs in a simplified machine language, WeMIPS. It is based on a reduced instruction set computer (RISC) design, originally developed by the MIPS Computer Systems. (wiki) CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
84 Machine Language (wiki) We will be writing programs in a simplified machine language, WeMIPS. It is based on a reduced instruction set computer (RISC) design, originally developed by the MIPS Computer Systems. Due to its small set of commands, processors can be designed to run those commands very efficiently. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
85 Machine Language (wiki) We will be writing programs in a simplified machine language, WeMIPS. It is based on a reduced instruction set computer (RISC) design, originally developed by the MIPS Computer Systems. Due to its small set of commands, processors can be designed to run those commands very efficiently. More in future architecture classes... CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
86 Hello World! in Simplified Machine Language (WeMIPS) CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
87 WeMIPS (Demo with WeMIPS) CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
88 In Pairs or Triples: Write a program that prints out the alphabet: a b c d... x y z CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
89 WeMIPS (Demo with WeMIPS) CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
90 Lecture Slip: tinyurl.com/yb8lcvl7 CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
91 Final Overview: Format The exam is 2 hours long. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
92 Final Overview: Format The exam is 2 hours long. There are 4 different versions to discourage copying. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
93 Final Overview: Format The exam is 2 hours long. There are 4 different versions to discourage copying. It is on paper. No use of computers, phones, etc. allowed. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
94 Final Overview: Format The exam is 2 hours long. There are 4 different versions to discourage copying. It is on paper. No use of computers, phones, etc. allowed. You may have 1 piece of 8.5 x 11 piece of paper. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
95 Final Overview: Format The exam is 2 hours long. There are 4 different versions to discourage copying. It is on paper. No use of computers, phones, etc. allowed. You may have 1 piece of 8.5 x 11 piece of paper. With notes, examples, programs: what will help you on the exam. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
96 Final Overview: Format The exam is 2 hours long. There are 4 different versions to discourage copying. It is on paper. No use of computers, phones, etc. allowed. You may have 1 piece of 8.5 x 11 piece of paper. With notes, examples, programs: what will help you on the exam. No origami it s distracting to others taking the exam. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
97 Final Overview: Format The exam is 2 hours long. There are 4 different versions to discourage copying. It is on paper. No use of computers, phones, etc. allowed. You may have 1 piece of 8.5 x 11 piece of paper. With notes, examples, programs: what will help you on the exam. No origami it s distracting to others taking the exam. Best if you design/write yours since excellent way to study. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
98 Final Overview: Format The exam is 2 hours long. There are 4 different versions to discourage copying. It is on paper. No use of computers, phones, etc. allowed. You may have 1 piece of 8.5 x 11 piece of paper. With notes, examples, programs: what will help you on the exam. No origami it s distracting to others taking the exam. Best if you design/write yours since excellent way to study. The exam format: CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
99 Final Overview: Format The exam is 2 hours long. There are 4 different versions to discourage copying. It is on paper. No use of computers, phones, etc. allowed. You may have 1 piece of 8.5 x 11 piece of paper. With notes, examples, programs: what will help you on the exam. No origami it s distracting to others taking the exam. Best if you design/write yours since excellent way to study. The exam format: 10 questions, each worth 10 points. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
100 Final Overview: Format The exam is 2 hours long. There are 4 different versions to discourage copying. It is on paper. No use of computers, phones, etc. allowed. You may have 1 piece of 8.5 x 11 piece of paper. With notes, examples, programs: what will help you on the exam. No origami it s distracting to others taking the exam. Best if you design/write yours since excellent way to study. The exam format: 10 questions, each worth 10 points. Style of questions: what does the code do? short answer, write functions, top down design, & write complete programs. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
101 Final Overview: Format The exam is 2 hours long. There are 4 different versions to discourage copying. It is on paper. No use of computers, phones, etc. allowed. You may have 1 piece of 8.5 x 11 piece of paper. With notes, examples, programs: what will help you on the exam. No origami it s distracting to others taking the exam. Best if you design/write yours since excellent way to study. The exam format: 10 questions, each worth 10 points. Style of questions: what does the code do? short answer, write functions, top down design, & write complete programs. Sample exam available on-line after Thanksgiving Break. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
102 Final Overview: Format The exam is 2 hours long. There are 4 different versions to discourage copying. It is on paper. No use of computers, phones, etc. allowed. You may have 1 piece of 8.5 x 11 piece of paper. With notes, examples, programs: what will help you on the exam. No origami it s distracting to others taking the exam. Best if you design/write yours since excellent way to study. The exam format: 10 questions, each worth 10 points. Style of questions: what does the code do? short answer, write functions, top down design, & write complete programs. Sample exam available on-line after Thanksgiving Break. Mock exam: last day of lecture and discussed in recitation. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
103 Final Overview For each question below, write only the function header (name & inputs) and return values (often called the Application Programming Interface (API)): Write a function that takes a whole number and returns the corresponding binary number as a string. Write a function that takes a weight in kilograms and returns the weight in pounds. Write a function that, given a DataFrame, returns the minimal value in the first column. Write a function that computes the total monthly payment when given the initial loan amount, annual interest rate, number of years of the loan. Write a function that takes a string and returns its length. (Hint: highlight key words, make list of inputs, list of outputs, then put together.) CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
104 Final Overview For each question below, write the function header (name & inputs) and return values (often called the Application Programming Interface (API)): Write a function that takes a whole number and returns the corresponding binary number as a string. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
105 Final Overview For each question below, write the function header (name & inputs) and return values (often called the Application Programming Interface (API)): Write a function that takes a weight in kilograms and returns the weight in pounds. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
106 Final Overview For each question below, write the function header (name & inputs) and return values (often called the Application Programming Interface (API)): Write a function that, given a DataFrame, returns the minimal value in the first column. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
107 Final Overview For each question below, write the function header (name & inputs) and return values (often called the Application Programming Interface (API)): Write a function that computes the total monthly payment when given the initial loan amount, annual interest rate, number of years of the loan. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
108 Final Overview For each question below, write the function header (name & inputs) and return values (often called the Application Programming Interface (API)): Write a function that takes a string and returns its length. CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
109 Recap: Python, Languages, & Design Python language CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
110 Recap: Python, Languages, & Design Python language Logical Circuits CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
111 Recap: Python, Languages, & Design Python language Logical Circuits Simplified Machine Language CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
112 Recap: Python, Languages, & Design Python language Logical Circuits Simplified Machine Language Design: from written description ( specs ) to function inputs & outputs ( APIs ) CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
113 Lecture Slip: tinyurl.com/yb8lcvl7 CSci 127 (Hunter) Lecture 11: tinyurl.com/yb8lcvl7 15 November / 48
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