6.11. Write Code Questions

Warning

Be careful not to create infinite loops, as they will cause the page to freeze.

Fix the 5 errors in the code below to return a countdown of the numbers from 10 to 0, including 0.

def countdown(): counter = 10 answer = "" while Counter > 0: answer = answer + str(counter) + " " counter = counter + 1 Return answer countDown() ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): output = countdown() self.assertEqual(output,"10 9 8 7 6 5 4 3 2 1 0 ") myTests().main()

Fix the 5 errors in the code below to return a countdown of the numbers from 10 to 0, including 0.

def countdown(): counter = 10 answer = "" # Keep running loop until counter equals 0 (use <=) # Use correct variable name (counter is lowercase) while counter >= 0: answer = answer + str(counter) + " " # Decrement to lower the counter counter = counter - 1 # Keyword return is lowercase return answer # Call correct function name (countdown) countdown() ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): output = countdown() self.assertEqual(output,"10 9 8 7 6 5 4 3 2 1 0 ") myTests().main()

The following code will loop way too many times. Change one line to make the loop only have five iterations.

x = 5 while x < 100: print(x) x = x + 1

Make 5 changes to the code below to correctly print a count up from -10 to 0, including 0.

output = "" x = -10 while x < 0 x = x - 1 output = output + str(x) + " " print(output ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(output,"-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 ") myTests().main()

Make 5 changes to the code below to correctly print a count up from -10 to 0, including 0.

output = "" # Start x at -11 so it stays under 0 x = -11 # First line of a loop ends with a colon (:) while x < 0: # Since the iteration variable is negative, increase the count x = x + 1 # Output reassignment is within the loop output = output + str(x) + " " # Close print parentheses print(output) ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(output,"-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 ") myTests().main()

Finish lines 1 and 5 so that the following code correctly prints every integer from -5 to -1, including -1.

output = x = -5 while x < 0: output = output + str(x) + " " x = print(output) ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(output,"-5 -4 -3 -2 -1 ") myTests().main()

Complete the code on lines 4 and 6 so that it prints the number 6.

x = 3 i = 0 while i < 3: x = i = i + 1 print() ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(x,6) myTests().main()

Complete the code on lines 4 and 6 so that it prints the number 6.

x = 3 i = 0 while i < 3: # Increase x by 1 for each run of the loop x = x + 1 i = i + 1 # Print the x variable print(x) ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(x,6) myTests().main()

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This function currently takes a start and stop argument and uses a for loop to find the sum of all the numbers between them (inclusive). Change the for loop to a while loop while still using the same parameters.

def sumFunc(start, stop): sum = 0 for num in range(start, stop + 1): sum = sum + num return sum print(sumFunc(1,10)) ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(sumFunc(1, 10),55,"Tested sumFunc on inputs 1 and 10") self.assertEqual(sumFunc(10, 3),0,"Tested sumFunc on inputs 10 and 3") self.assertEqual(sumFunc(-5, 0),-15,"Tested sumFunc on inputs 20 and 50") self.assertEqual(sumFunc(-3, 12),72,"Tested sumFunc on inputs -3 and 12") myTests().main()

This function currently takes a start and stop argument and uses a for loop to find the sum of all the numbers between them (inclusive). Change the for loop to a while loop while still using the same parameters.

def sumFunc(start, stop): sum = 0 # Create an iteration variable, initialized to the start argument num = start # Use while loop until iteration variable is less than # or equal to stop argument while num <= stop: # Add number to sum sum = sum + num # Increase iteration variable num += 1 # Return the sum return sum print(sumFunc(1,10)) ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(sumFunc(1, 10),55,"Tested sumFunc on inputs 1 and 10") self.assertEqual(sumFunc(10, 3),0,"Tested sumFunc on inputs 10 and 3") self.assertEqual(sumFunc(-5, 0),-15,"Tested sumFunc on inputs 20 and 50") self.assertEqual(sumFunc(-3, 12),72,"Tested sumFunc on inputs -3 and 12") myTests().main()

The program below is supposed to print the times tables from 1 to 3, but there are 6 errors. Fix the errors.

for x in range(1, 3): for y in range(1, 4) print(str(x) + " * " str(y) + " = " x * y)

The following code prints the times tables for 1 to 3 using two for loops. Rewrite the program to use a while and a for loop instead.

for x in range(1, 4): for y in range(1, 11): print(str(x) + " * " + str(y) + " = " + str(x * y))

# There are a few different ways this can be done # One is shown here for x in range(1, 4): # Create an iteration variable, starting in the range y = 1 # Use while loop if the iteration variable is less than 11 while y < 11: # Print the string print(str(x) + " * " + str(y) + " = " + str(x * y)) # Increment the iteration variable y = y + 1

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