Midterm No. 2 for V XXX Sample for Practice Only

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1 Midterm No. 2 for V XXX Sample for Practice Only Warning: This is a long practice test. I will make an effort to keep the problems short enough to finish within the time limit of the real test. These problems are the right level of complexity. So the actual test may take a little less time to do. There are three sections. Sections 1 is worth 20 points. Section 2 is worth 40 points. Section 3 is worth 50 points. Partial credit is possible for each question. The maximum score for the test is 110 points. It is essential that you put your name on all test materials. It can be difficult identify the author of an unsigned test and it would be better to avoid this problem. Section 1: Below will be a number of function definitions containing errors. On the appropriate line numbers in the table below the function, please list the errors (if any), along with possible corrections. In each case, a minimum number of errors is listed. You do not need to find more errors than that number. For example, if the description says to find three errors, you only need to find three, even if there are actually four or five errors. If you identify more errors than the minimum, you will be graded on the total number of errors that you list. For example if you list 3 actual errors and you are mistaken about a fourth one, you will get 3/4 of the total number of points available. The comments are meant to be instructive. Please do not look in the comments for errors. Assume that the comments are error-free with one exception: if they are incorrectly marked, e.g., if Note: is used at the beginning of a comment line instead of #. Sample 1: The function minus takes two numbers as input and subtracts the second from the first. There is only one error. Line Code 1. def minus(total,decrement) 2 output = total - decrement 3. return(output) Line Correction of Error 1. need to add colon (:) at end of line 2. 3.

2 Question 1: This function translates Roman Numerals to numbers. Please find 4 errors. Line Code 1. def convert roman character(character): 2. if (character == I): 3. return(1) 4. elif(character == V ): 5. return(5) 6. elif(character == X ): 7. return(10) 8. elif (character == L ): 9. return(50) 10. elif(character == C ): 11. return(100) 12. else(character == D ): 13. return(500) 14. else(character == M ): 15. return(1000) 16. def roman numeral convert(string): 17. total = current = last = ## roman numerals are either added or subtracted 21. ## depending on the next character 22. ## thus we must usually wait one character before 23. ## determining what to do with it 24. for character in range(len(string)): 25. current = convert roman character(character) 26. if (last == 0): 27. last = current 28. ## if we are not storing anything, we store current 29. else last < current: 30. total = total + current - last 31. last = ## in case of subtraction, we can add the difference immediately 33. ## but there is nothing to store for next time 34. else: 35. total = total + last 36. last = current 37. ## usually, we just add the last one when we see the current one 38. total = total + last 39. return(total)

3 Line Correction of Error

4 Section 2: You will be asked to determine what a program does given a particular input and given particular outcomes for random number functions. You will be asked what print statements do, taking into account where in the program they occur. Thus if a print statement occurs within a loop, you will be expected to predict how many times the print statement will print (and what it will print each time). Similarly, if a print statement is in the body of an if, else or elsif statement, you will be expected to determine if the print statement will do anything at all. You will be expected to determine what the function returns (if anything). Question 2: The following program prints out strings consisting of spaces asterisks and percent signs. Random numbers are used to determine the following: (1) how many non-space characters to print; (2) how many spaces to print; (3) whether to print an asterisk or percent; and (4) how long to pause (sleep) between lines of print. This program prints to the screen forever (until interrupted by a control-c). Think of it like a screen-saver. import random import math import time def random_1_to_10(): return(math.ceil(random.random()*10)) def random_1_or_2(): return(math.ceil(random.random()*2)) def snow_flakes(): number = 0 spaces = 0 character = while(true): number = random_1_to_10() spaces = random_1_to_10() for number in range(number): if random_1_or_2() == 1: character = * else: character = % print( *spaces+character,end= ) print() time.sleep(random_1_to_10()*.03) Approximately, write out 3 consecutive lines of what would be printed assuming that: random 1 to 10 generated 5, 7, 4, 5, 2, 10, 2, 2, 7, 3, 7, 5, 7 and 9 (only use the values needed); and random 1 or 2 generates: 2, 1, 2, 2, 2, 2, 1, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 1 and 2 (only use the values needed). Note that your answer need only be approximate and that there may be random numbers listed that you don t end up using. Also indicate how much time would occur between the first and second line; and how much time would occur between the second and third line.

5 Question 3: Do your best to understand how the functions: turtle zig zag and turtle scribble work. Then answer 3a and 3b: 3a Assuming the turtle begins at the center of the screen facing right (along the X axis), (approximately) draw the line that would result from: turtle zig zag(3) 3b Assuming the turtle begins at the center of the screen facing right (along the X axis), (approximately) draw the line that would result from: turtle scribble(3) Assume that the following random directions were generated along the way: 193, 49, 179 Also answer how many times would the color change during this function call? import turtle import random import math my_screen = turtle.screen() my_turtle = turtle.turtle() my_screen.colormode(255) ## makes it so the colors are divided up into ## 3 values from 0 to 255 ## one value represents red, another green and the foinal one blue def turtle_zig(): ## This draws a leftward sixty degree angle my_turtle.pd() my_turtle.left(60) my_turtle.pu() def turtle_zag(): ## This draws a rightward sixty degree angle my_turtle.pd() my_turtle.right(60) my_turtle.pu() def random_direction(): return(math.ceil(random.random()*360)) def random_0_to_255(): return(math.floor(random.random()*255)) def random_pen_color(): red = random_0_to_255() green = random_0_to_255() blue = random_0_to_255() my_turtle.pencolor(red,green,blue)

6 def turtle_zig_zag(repetitions): for number in range(repetitions): turtle_zig() turtle_zag() def turtle_scribble(repetitions): for number in range(repetitions): if (number%2)== 0: random_pen_color() turtle_zig() turtle_zag() my_turtle.left(random_direction()) ### note that if the turtle gets lost, use the ### command: my_turtle.home() ### and then start again Section 3: Write Functions as specified. Question 4: Write a function called mirror image string that takes a string as an argument and returns the string concatenated with the string backwards. For example, mirror image string( red ) would return a value of redder The backwards portion should be created one character at a time using a loop. Question 5: Write a program that a vending machine could use to give change. Assume that the person will always insert one to five dollar bills and that the cost of the item can be any amount less than five dollars. The machine will dispense change in some combination of dollar coins, quarters, dimes, nickels and pennies. Print out Not enough Money. if the cost of the item exceeds the money put into the machine. For all other situations, determine what change to give. Assume that it is always better to use higher denominations than lower ones. The program should try to use as many dollar coins as possible and only use quarters if necessary. Then it must use as many quarters as possible and only use dimes if possible; then as many dimes as possible before using nickels; and as many nickels as possible before using any pennies.

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