More on Conditionals: if-elif-else, Boolean Expressions

Transcription

1 CptS 111 Lab #6 More on Conditionals: if-elif-else, Boolean Expressions Learning Objectives: By the end of this lab you should: be comfortable using if-elif-else constructs be comfortable using logical/boolean operators and expressions Prerequisites: Before starting this lab, you should be familiar with: branching constructs relational operators logical/boolean operators logical/boolean expressions Task 1: Grades Revisited In Lab #1 you wrote a program to calculate your score for this class. Recall that scoring is done as follows: score = 0.17 exam exam+0.18 final +0.5 prog assign zypa+0.0 zyca+0.1 lab where exam1 and exam are your scores on the two midterms, final is your score on the final exam,prog assign is your programming assignments score, zypa is your zybooks participation activities score, zyca is your zybooks challenge activities score, andlab is your labs score. CptS 111 grades are assigned as follows: : A 90-94: A : B : B 75-79: B : C : C 60-64: C : D < 50: F For this task write a program with four functions as follows: get scores(): Called from main() with no parameters. Prompts user for all their scores and returns them tomain(). 1

2 calc score(): Called from main() with all scores as parameters. Returns score to main(). calc grade(): Called from main() with score as parameter. Returns grade to main(). Use theif-elif-else construct together with Boolean expressions with relational operators. main(): Calls the three functions and prints yourscore andgrade to the screen. Here are examples of the output. Boldface font is text that is entered. 1 Please enter the following information: Exam 1 score: Exam score: Final exam score: Programming assignments score: 0 7 zybooks participation activities score: zybooks challenge activities score: Labs score: Your score for CptS 111 is: Your grade for CptS 111 is: B- 1 Please enter the following information: Exam 1 score: 8 4 Exam score: 84 5 Final exam score: 84 6 Programming assignments score: zybooks participation activities score: zybooks challenge activities score: Labs score: Your score for CptS 111 is: Your grade for CptS 111 is: A- After your program is working properly, demonstrate it to your TA to get credit. Task : Baseball Bonuses Write a program to calculate and display a professional baseball player s bonus at the end of a season. The bonus is calculated as follows: 1. All-Star Game appearance = $5,000. Regular season MVP = $75,000. World Series MVP = $100, Gold Glove award = $50,000

3 5. Silver Slugger award = $5, Home run champ = $5, Batting average champ = $5,000 Prompt the user with a question related to each of the above categories using successiveif statements and augmented assignment. If the response is y for yes, add the bonus to the total; otherwise, if the response is n, move to the next question. You can do everything in the function main() and then use a function call tomain(). The following shows the proper behavior of the program: 1 For each of the following, enter y for yes and n for no. All-Star Game appearance? y Regular season MVP? n 4 World Series MVP? n 5 Gold Glove award? n 6 Silver Slugger award? y 7 Home run champ? y 8 Batting average champ? n 9 This baseball player s bonus was $ After your program is working correctly, show it to your TA for credit. Task : Politics A person is eligible to be a US senator if they are least 0 years old and have been a US citizen for at least 9 years. To be a US representative, these numbers are 5 and 7, respectively. Write a program that prompts the user for their age in years and their number of years of citizenship. Display the user s eligibility for the Senate and the House. For this task write a program with three functions as follows: run4senate(): Called from main() with two parameters, a person s age and years of citizenship. Prints the person s eligibility. run4house(): Called from main() with two parameters, a person s age and years of citizenship. Prints the person s eligibility. main(): Prompts the user for their age and years of US citizenship and calls the two functions. Example of output with entered text in boldface font. 1 Enter your age in years: 8 Enter the number of years you have been a US citizen: 8 4 You re not eligible to run for the Senate, but maybe you can run for 5 the House of Representatives. 6 You re eligible to run for the House of Representatives!

4 After your program is working correctly, show it to your TA for credit. Task 4: Income Tax Bracket A new tax law was approved in 018 with new tax rates for different incomes. For a person filing as a single taxpayer, the new marginal rates for the given ranges of income are: $0 - $9,55: 10% $9,56 - $8,700: 1% $8,701 - $8,500: % $8,501 - $157,500: 4% $157,501 - $00,000: % $00,000 - $500,000: 5% > $500,000: 7% Write a program with two functions that lets the user know their marginal tax rate. get rate(): A void function called from main() with one parameter, a person s income. Uses if-elif-else construct together with Boolean and relational operators. Prints the marginal tax rate. main(): Prompts the user for their income and callsget rate(). Example of output with entered text in boldface font. 1 Enter your annual income: Your marginal tax rate is %. When your function is working properly, show it to your TA for credit. Task 5: Doomsday Algorithm, Yet Again A year s Doomsday is given by the equation: Doomsday = (((yr // 1)+(yr %1)+(yr %1)// 4)%7+anchor) %7 (1) where yr is the last two digits of the year and the anchor day is an integer between 0 and 6 with 0 corresponding to Sunday and 6 to Saturday. Previously you ve written three functions for the Doomsday algorithm, set anchor(), which takes as its parameter the first two digits of the year and returns a if the digits are0 and a if the digits are 19, calc doom(), which calculates the doomsday using the algorithm given above, and amain() function, which prompts for a four-digit integer year, extracts the first two and last two digits, calls the two functions previously described, and then prints out the Doomsday. Today you ll finish up the Doomsday algorithm by writing one more function and altering main(). Thus, for this task: Write a non-void function get day() that takes as its parameter the doomsday calculated by calc doom(), determines which day of the week it represents (0=Sunday), and returns this day tomain(). Use theif-elif-else construct. 4

5 Alter yourmain() function for Lab #5 so that it prompts the user for a four-digit integer year, extracts the first two and last two digits of the year, callsset anchor which returns the anchor, calls calc doom() which returns the doomsday, and finally calls get day() to determine the day of the week which it then prints as the Doomsday. Anchor days for are Tuesday (=) and for Wednesday (=). Example results are shown below. 1 Enter the year in four digits: 1966 Doomsday: Monday 4 Enter the year in four digits: Doomsday: Wednesday Run the program for your TA to get credit. 5