Write a c program to find out sum of digit of given 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;
}

OUTPUT
Enter a number: 12345
Sum of digits of number:  15

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;
}

OUTPUT
Enter a number: 4567
Sum of digits of number:  22

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;
}

OUTPUT
Enter a number: 45
Sum of digits of number:  9