Sum of Digits, Reduced to a Single Digit
MediumRead a positive integer and repeatedly replace it by the sum of its digits until a single digit remains, printing every stage on one line separated by a space, a hyphen, a greater-than sign, and a space: 9875 prints 9875 -> 29 -> 11 -> 2. A number that already has one digit prints just itself. Use a nested loop: the outer loop runs while the number has more than one digit, and the inner loop peels the digits with % 10 and / 10. If the number is below 1, print N must be positive and return 1. If it cannot be read, print invalid input and return 1.
Success Criteria
Your code must pass 8 test case(s) to complete this exercise. 3 hint(s) are available if you need help.
How did you find this exercise?
Your rating helps us improve the content.
Sign in to track your progress
You can work on exercises as a guest, but sign in to track your progress and save your submissions.