#include <stdio.h>
int sum(int num) {
if (num == 0)
return 0;
return sum(num / 10) + (num % 10);
}
int main() {
int num, result;
printf("**C Program to find sum of digits using recursion**\n");
printf("Enter the number: ");
scanf("%d", &num);
result = sum(num);
printf("Sum of digits in %d is %d\n", num, result);
return 0;
}Output
**C Program to find sum of digits using recursion**
Enter the number: 5432
Sum of digits in 5432 is 14What did you think?