Generate armstrong number

#include < stdio.h >

#include<conio.h>

int main()
{
  int r;
  long int number = 0, c, sum = 0, temp;

  printf("Enter an integer upto which you want to find armstrong numbers\n");
  scanf("%ld",&number);

  printf("Following armstrong numbers are found from 1 to %ld\n",number);

//if sum of cubes of each digit in a number is same as the number then it is called as armstrong no.
  for( c = 1 ; c < = number ; c++ )
  {
  temp = c;
  while( temp != 0 )
  {
  r = temp%10;
  sum = sum + r*r*r;
  temp = temp/10;
//taking unit place digits cube and adding into sum
  }
  if ( c == sum )
  printf("%ld\n", c);
//If no is Armstrong no then print
  sum = 0;
  }

getch();

}