Armstrong numbers list(input from user)

#include<stdio.h>
int main()
//Armstrong  numbers list
{

    int num1,num2,temp,r,sum=0,i;
    printf("enter first number: \n");
    scanf("%d",&num1);
    printf("enter last number: \n");
    scanf("%d",&num2);

     for(i=num1;i<=num2;i++){
        temp=i;
    while(temp!=0){
        r=temp%10;
        sum=sum+r*r*r;
        temp=temp/10;
    }
    if (sum==i){
   printf("%d\n",i);
   }
    sum=0;

     }

    return 0;
}