Write a program to find the sum of digits of a 5 digit number using recursion.

Dr. A.P.J. Abdul Kalam Technical University, Lucknow

KCS151 / KCS251 Programming for Problem Solving - Using C Language

Lab Exercises

21. Write a program to find the sum of digits of a 5 digit number using recursion.

/*

 File: Prgrm21.c

 Author: Aditya Saini

 Date: Jan 17, 2021

 Description: Program to find the sum of digits of a 5 digit number using recursion.

*/

#include <stdio.h>

int sum_of_digits (int);

int main (void)

{

     int num;

     int sum;

     //Input number

     printf ("Input number: ");

     scanf ("%d", &num);

     //Fucntion call

     sum = sum_of_digits (num);

     //Print result

     printf ("Sum of digits: %d", sum);

     return 0;

};

int sum_of_digits (int num)

{

     //Calculate sum of digits

     //Base case

     if (num <= 9)

          return num;

     else

          //Recursive call

          return num % 10 + sum_of_digits (num / 10);

};

Output

Input number: 12345

Sum of digits: 15