Sonoma State University
Department of Computer Science
CS-460: Programming Languages
Exercise 12a

Objective:

With your team, enter the the following Python program in your favorite editor on our Blue Unix server (blue.cs.sonoma.edu).

#!/usr/bin/python3

def positive_input():
    x = int(input("Enter a positive integer: "))
    while x <= 0:
        print("Invalid input!")
        x = int(input("Enter a positive integer: "))
    return x

def main():
    n = positive_input()
    numbers = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
    while n > 0:
        numbers[n % 10] = numbers[n % 10] + 1
        n = n // 10
    print(numbers)

main()

Preparation to make Python program executable on Blue:

  • chmod 750 python_program.py

Question:

What does this Python program do? Specifically, what does the output represent? Do you see a pattern?

Hints:

Examine the output by entering the following numbers:

  • 111
  • 222
  • 333
  • 1234567890

Submitting your solution:

Since this is a group assignment, please write the names of each member of the team student on your assignment submission along with "Exercise 12a".