Answer: Python Puzzler #1723

The answer is B. The program prints:

3 1
What the program prints
Checked by running the program for real.

Why?

// divides and throws away the remainder: each friend gets 3 sweets. % gives the remainder: 1 sweet left over.

Trace table

A trace table follows the program step by step. Here’s this one:

sumanswer
13 // 43
13 % 41

The code again

sweets = 13
friends = 4
print(sweets // friends, sweets % friends)

Try it: change one number in the program and predict the new output before you run it.