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Add digits using recursion C Program


This Program will add numbers using recursion 

#include <stdio.h>
 
int add_digits(int);
 
int main() {
  int n, result;
 
  scanf("%d", &n);
 
  result = add_digits(n);
 
  printf("%d\n", result);
 
  return 0;
}
 
int add_digits(int n) {
  static int sum = 0;
 
  if (n == 0) {
    return 0;
  }
 
  sum = n%10 + add_digits(n/10);
 
  return sum;
}
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