6.Armstrong number

#include<stdio.h>
main()
{
    int n,a,sum=0,r;
    scanf("%d",&n);
    while(n>0)
    {
        r=n%10;
        a=r*r*r;
        sum=sum+a;
        n=n/10;
    }
    if(n==sum)
    printf("Armstrong number");
    else
        printf("not Armstrong number ");
        return 0;

}