Python: Accept a positive number and subtract from this number the sum of its digits

Last update on December 21 2024 07:19:16 (UTC/GMT +8 hours)

Subtract Sum of Digits

Write a Python program that accepts a positive number and subtracts from it the sum of its digits, and so on. Continue this operation until the number is positive.

Sample Solution:

Python Code:

# Define a function 'repeat_times' that repeatedly subtracts the sum of the digits
# of a number from the number until it becomes non-positive, and then returns the result.
def repeat_times(n):
    # Convert the input number 'n' to a string for digit manipulation.
    n_str = str(n)
    
    # Continue the loop while 'n' is greater than 0.
    while n > 0:
        # Subtract the sum of the digits of 'n' from 'n'.
        n -= sum([int(i) for i in list(n_str)])
        
        # Update 'n_str' with the string representation of the updated 'n'.
        n_str = list(str(n))
    
    # Return the final value of 'n'.
    return n

# Test the 'repeat_times' function with different values of 'n' and print the results.
print(repeat_times(9))
print(repeat_times(20))
print(repeat_times(110))
print(repeat_times(5674))

Sample Output:

0
0
0
0

Explanation:

The above Python code defines a function named "repeat_times()" that repeatedly subtracts the sum of the digits of a number from the number until the number becomes non-positive. Here's a brief explanation:

• Function Definition:
• def repeat_times(n):: Define a function named "repeat_times()" that takes an integer n as input.
• Convert to String:
• n_str = str(n): Convert the input number 'n' to a string for digit manipulation.
• Repetition Loop:
• while n > 0:: Continue the loop while 'n' is greater than 0.
• n -= sum([int(i) for i in list(n_str)]): Subtract the sum of the digits of 'n' from 'n'.
• n_str = list(str(n)): Update 'n_str' with the string representation of the updated 'n'.
• Return Result:
• return n: Return the final value of 'n' after it becomes non-positive.
• Function Testing:
• Test the "repeat_times()" function with different values of 'n' (9, 20, 110, 5674).
• Print the results of the function calls.

Flowchart:

Python Code Editor:

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