C program to calculate sum of all digits using recursion

In this program, we are going to share a C program to calculate the sum of all digits using recursion. If you are a beginner and want to start learning the C programming, then keep your close attention in this tutorial as I am going to share a C program to calculate the sum of all digits using recursion with the output.

Collection of 200+ C problems with solutions.

We have designed this program for beginners for learning purpose. Copy below c program and execute it with c compiler to see the output of the program.

#include <stdio.h>

int sumDigits(int num)
{
    static int sum=0;
    if(num>0)
    {
        sum+=(num%10);
        sumDigits(num/10);
    }
    else
    {
        return sum;
    }
}
int main()
{
    int number,sum;
     
    printf("Enter a positive integer number: ");
    scanf("%d",&number);
     
    sum=sumDigits(number);
     
    printf("Sum of all digits are: %d\n",sum);
 
    return 0;
}

#include <stdio.h>

int sumDigits(int num)

{

static int sum=0;

if(num>0)

{

sum+=(num%10);

sumDigits(num/10);

}

else

{

return sum;

}

int main()

{

int number,sum;

printf("Enter a positive integer number: ");

scanf("%d",&number);

sum=sumDigits(number);

printf("Sum of all digits are: %d\n",sum);

return 0;

}

Program Output:

Enter a positive integer number: 1230
Sum of all digits are: 6

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C program to calculate sum of all digits using recursion

Program Output:

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