tinhtong

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
#include<math.h>
#define ou printf(
#define in scanf(
int sum(int n);
main()
{
    int n;
    ou"Nhap vao so n = ");
    in"%d",&n);
    ou"tong cac chu so trong %d la %d",n,sum(n));

}
int sum(int n)
{
    int s=0;
    while (n!=0)
    {
        s+=n%100;
        n/=100;
    }
    return s;
}