Find sum of the digit of number using c program

C program to calculate or find sum of each digits of a given number

#include<stdio.h>

int main(){

int num,sum=0,r;

printf("\nEnter a number:");

scanf("%d",&num);

while(num){

r=num%10;

num=num/10;

sum=sum+r;

}

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

return 0;

}

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