CS 122 - Quiz 2

Solution

Here's my solution to problem 1. It is just a simple raw_input statement followed by an if statement
Problem 1 Solution

There are a lot of ways to go about solving problem 2. The basic idea is to keep multiplying the number by higher integers until you get to a value greater than or equal to 50. I saw good solutions using a while loop and good solutions using a for loop.
Problem 2 Solution

Here's my solution to problem 3.
Problem 3 Solution

The three errors were in problem 3 were:

if userInput = "q": should be if userInput == "q": with a double equals sign to check for equality (line 4)
elif n * n > targetNumber should have a : at the end of the line (line 13)
shouldcontinue did not have a capital C. It should have been spelled shouldContinue (line 1)

Posted Thursday, July 30

Problem 1

User input and Conditionals

Write a program that asks the user for their name. If their name is "Shad", print out "Hi professor", otherwise print out "Hi there"

Here's what a run of the program would look like if the user entered: "Shad"

What is your name? Shad Hi professor

And here's what another run would look like if the user entered: "Joe"

What is your name? Joe Hi there

Problem 2

Loops

Write a program that asks the user to input a number between 1 and 10 and then prints out all the multiples of that number that are less than 50. Try to match the look of the example runs exactly.

Here's what a run of the program would look like if the user entered "10":

Enter an integer between 1 and 10: 10 Multiples of 10 that are less than 50 are: 10 20 30 40

Here's what a run of the program would look like if the user entered "7":

Enter an integer between 1 and 10: 7 Multiples of 7 that are less than 50 are: 7 14 21 28 35 42 49

Here's what a run of the program would look like if the user entered "2":

Enter an integer between 1 and 10: 2 Multiples of 2 that are less than 50 are: 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48

Problem 3

Finding errors

The following program determines whether an integer is a perfect square. There are no logic bugs in the program, but there are 2 syntax errors and 1 other error. Fix the bugs so that the program runs correctly. You can copy and paste the code from the web browser or just download it using this link

shouldcontinue = True while shouldContinue == True: userInput = raw_input("Enter an integer to see if it's a perfect square (q to quit): ") if userInput = "q": print "Goodbye" shouldContinue = False else: targetNumber = int(userInput) for n in range(targetNumber): if n * n == targetNumber: print userInput + " is a perfect square!" break elif n * n > targetNumber print userInput + " is not a perfect square" break

Here's what a sample run of the program after it has been fixed should look like:

Enter an integer to see if it's a perfect square (q to quit): 3 3 is not a perfect square Enter an integer to see if it's a perfect square (q to quit): 4 4 is a perfect square! Enter an integer to see if it's a perfect square (q to quit): 5 5 is not a perfect square Enter an integer to see if it's a perfect square (q to quit): 6 6 is not a perfect square Enter an integer to see if it's a perfect square (q to quit): 7 7 is not a perfect square Enter an integer to see if it's a perfect square (q to quit): 8 8 is not a perfect square Enter an integer to see if it's a perfect square (q to quit): 9 9 is a perfect square! Enter an integer to see if it's a perfect square (q to quit): q Goodbye

Note: that you do not need to make major changes to this program. The changes required are small. Two of the errors are invalid syntax and the other is a programming typo.

Side note, this program doesn't properly handle the case where a user enters the numbers 1 or 2, that's okay, I just wanted to keep the program as simple as possible.

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Your solution to problem 1: Attach your python program that is your solution to just the first problem
Your solution to problem 2: Attach your python program that is your solution to just the second problem
Your solution to problem 3: Attach your python program that is your solution to just the third problem