Programs in C language

#include<stdio.h>

void main()
{
    int n, n1, r, sum=0;
    clrscr();
    printf("Enter a number:");
    scanf("%d",&n);
    
    n1 = n;
    while(n>0)
    {
    	r = n%10;
        sum=sum+(r*r*r);
        n = n/10;
    }
    
    if(n1 == sum)
    	printf("Armstrong number");
    else
    	printf("Not a Armstrong number");
    getch();
}