C program for sum of digits of a number

Code 1:

1. C program to add digits of a number

2. C program for sum of digits of a number

3. C program to calculate sum of digits

#include<stdio.h>

int main(){

  int num,sum=0,r;

  printf("Enter a number: ");

  scanf("%d",&num);

  while(num){

      r=num%10;

      num=num/10;

      sum=sum+r;

  }

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

  return 0;

}

Sample output:

Enter a number: 123

Sum of digits of number:  6

Code 2:

1. Sum of digits of a number in c using for loop

#include<stdio.h>

int main(){

  int num,sum=0,r;

  printf("Enter a number: ");

  scanf("%d",&num);

  for(;num!=0;num=num/10){

      r=num%10;

      sum=sum+r;

  }

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

  return 0;

}

Sample output:

Enter a number: 567

Sum of digits of number:  18

Code 3:

1. Sum of digits in c using recursion

#include<stdio.h>

int getSum(int);

int main(){

  int num,sum;

  printf("Enter a number: ");

  scanf("%d",&num);

  sum = getSum(num);

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

  return 0;

}

int getSum(int num){

    static int sum =0,r;

    if(num!=0){

      r=num%10;

      sum=sum+r;

      getSum(num/10);

    }

    return sum;

}

Sample output:

Enter a number: 45

Sum of digits of number:  9

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