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

## Python Basic - 1: Exercise-23 with Solution

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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