How to find Sum of digits of a number

#include<stdio.h>

int main() {

int a , i , sum = 0;

printf("Enter a number : " );

scanf("%d", &a);

while (a !=0) {

i = a % 10;

sum = sum + i;

a = a/10;

}

printf(" sum is %d", sum);

return 0;

}

C Code to find the sum of digits of a number

Output :

Enter a number : 234

sum is 9

=== Code Execution Successful ===