armstrong number

#include<stdio.h>
#include<conio.h>
void main()
{
int c,n,arm=0,r;
printf("enter an integer");
scanf("%d",&n);
c=n;
while(n!=0)
{
r=n%10;
arm=arm+r*r*r;
n=n/10;
}
if(c==arm)
printf("it is an armstrong number");
else
printf("not an armstrong");
getch();
}