Question

What will be printed to the screen when this program is run?

num = 100

while num > 0:
for i in range(100, 0, -25):
num = num - i
print(num)

Answer 1

The program prints the value of 'num' after a series of subtractions inside nested while and for loops. As 'num' is initially set to 100, and it's subtracted by 100 in the first iteration of the for loop, the program prints 0 and then exits.

Step-by-step explanation:

The provided script is a Python program, which includes a while loop and a for loop. When this program is run, it will print a sequence of numbers to the screen based on the arithmetic operations performed on the variable num within the loops.

Initially, num is set to 100. The outer while loop checks whether num is greater than 0, and then the inner for loop iterates four times with the values 100, 75, 50, and 25 (decremented by 25 each time). In each iteration of the for loop, the current value of i is subtracted from num. After each subtraction, num is printed to the screen.

To illustrate, the first iteration of the inner loop subtracts 100 from num (100 - 100 = 0), and prints 0. Since the value of num is now 0, the condition of the while loop is no longer satisfied, and the program terminates after printing 0 just once, as there are no further iterations.