Sum-of-digits-of-a-five-number.c

#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>

int main() {
	
    int n,i,sum=0,r;
    scanf("%d", &n);
    for(i=n;i>0;i=i/10)
    { r=i%10;
     sum=sum+r;  
    }
    printf("%d",sum);
    return 0;
}