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C Program to find Armstrong numbers between range m and n

/*
 * Program to print Armstrong number between range m and n
 * Armstrong  number is nothing but sum of cubes of digits of number is
 * equal to the number
 * ex: 153 is Armstrong number since 1^3+5^3+3^3=153
 * there are very few numbers hold above property; execute 
 * below program to find all numbers
 * b/w m and n
 */
#include <stdio.h>
void is_armstrong(int num)
{
  int sum=0, n, d;
  n=num;
  while(n){
  d=n%10;  /* extract digits of number*/
  sum=sum+(d*d*d);  /*take sum of them */
  n=n/10;
 }
 if(sum == num)  /*sum is same as number then it is Armstrong number*/
    printf("%d\n", sum);
}

int main()
{
int i,n,m;
printf("Enter range \n");
scanf("%d%d", &m, &n);

 for(i=m;i<=n;i++){
   is_armstrong(i);
 }

return 0;
}
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