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CSCI 141 Assignment 1: Variables, print, input, operators
Questions: 16 points Please answer the questions in the A1 Written quiz on Canvas. The questions on Canvas have been configured so that there is no time limit, but you have only 2 attempts to submit your answers. The score that is recorded in Canvas is the score that is the latest (most recent submission) of your attempts. 2 Programming Task: 20 points Congratulations! You’ve just been hired as a Python programmer at an education start-up company. Your first task is to develop a prototype of a program that kindergarten students will use to check their homework assignments which involve addition, multiplication, and division problems. Program Specification The program begins with a series of prompts, then prints a few lines to the screen in response. In total there are 6 lines that are printed each time the program is run: 1 1. Prompt the user for their name 2. Greet the user and ask them to supply the first integer 3. Prompt the user for a second integer 4. Output the sum of the two numbers 5. Output the product of the two numbers 6. Rephrase the division question, and output the whole number and remainder. All numerical outputs on the 6th line of output must be integers (whole numbers, without decimals). A sample invocation of the program is shown in Figure 1: Figure 1: Sample Output Although this is a simple set of steps, there are many, many different Python programs that can achieve it. The text of your prompts does not need to match the example exactly. However, your solution must follow the the instructions above exactly as specified. For example: • Both the greeting and the prompt for the first number must be printed on the second line of output. • The last (6th) line of output must rephrase the division question and output the whole number and remainder portions of the calculation on a single line. Valid Input and Error Checking You should assume that the user provides all requested inputs (via the keyboard) as instructed, and assume that all integers are positive numbers. Your program is not required to check the input or behave in any specific way if the above conditions are not met. Testing Your Program Testing is a major component in the process of writing software. Often, testing (detecting errors) and debugging (locating and fixing errors) takes way more effort than writing the code did in the first place. We’ll talk more about testing as the quarter progresses; in the meantime, the following table provides some helpful test cases that you can use to see if your program is working correctly. Try your code out with the given pairs of integers and see if your output matches the sum, product, and division result. 2 First Integer Second Integer Sum Product Division 7 5 12 35 1 remainder 2 5 7 12 35 0 remainder 5 3 3 6 9 1 remainder 0 1 678 679 678 0 remainder 1 8364724 9738 8374462 81455682312 858 remainder 9520 Submission Double check that your program works according to the specification. Take a look through the rubric below and make sure you won’t lose points for reasons that could easily be foreseen and fixed. When you’re finished, submit your program to Canvas as a single .py file named arithmetic.py. Finally, fill out the A1 Hours quiz with an estimate of the number of hours you spent on A1 (include both the written and programming portions in your estimate). Rubric Canvas questions 16 points Author, date, and program description given in comments at the top of the file 1 point Program prompts for user’s name on the first line 4 points Greeting on second line includes user’s name 4 points First integer prompt also appears on second line 2 points Correct sum output on fourth line 2 points Correct product output on fifth line 2 points Division question is rephrased, quotient and remainder are printed on sixth line 3 points Code is commented adequately and variables are appropriately named 2 points Total 36 points 3 3 Optional Challenge Problem Some assignments will come with an optional challenge problem. In general, these problems will be worth very small amounts of extra credit: this one is worth one point. Though the grade payoff is small, you may find them interesting to work on and test your skills in Python and algorithm development. The skills and knowledge needed to solve these problems are not intended to go beyond those needed for the base assignment, but less guidance is provided and more decisions are left up to you. The A1 challenge problem is as follows: Many online real estate websites have mortgage calculator features1 . These calculators ask for some information, such as the price of a home, the down payment (amount of the home price you’d pay up front), and the interest rate, then calculate the amount you’d have to pay monthly on a loan for the home. According to NerdWallet2 , the formula used to calculate the monthly payment based on these inputs is as follows: M = (P − D) r(1 + r) N (1 + r)N − 1 Where: M = The monthly payment P = The price of the home D = The down payment amount N = The number of months over which the loan will be paid off r = R/12, the monthly interest rate, which is the yearly rate divided by 12 Write a program that asks the user to enter P, D, N, and R, then outputs the monthly payment amount M. Notice that you will prompt the user for R, the annual interest rate, but the formula uses r, the monthly interest rate. 3.1 Submission Upload your submission to Canvas in a file called challenge.py. 1See https://www.zillow.com/mortgage-calculator/ for an example 2Go to https://www.nerdwallet.com/mortgages/mortgage-calculator/calculate-mortgage-payment and click “How to calculate your mortgage payment” for the source of the formula 4