C Program to Check Armstrong Number

C Program to Check Armstrong Number:

A positive integer is called an Armstrong number if the sum of cubes of individual digit is equal to that number itself .

example:

7 = 7^1
371 = 3^3 + 7^3 + 1^3 (27 + 343 +1)
8208 = 8^4 + 2^4 +0^4 + 8^4 (4096 + 16 + 0 + 4096).
1741725 = 1^7 + 7^7 + 4^7 + 1^7 + 7^7 + 2^7 +5^7 (1 + 823543 + 16384 + 1 + 823543 +128 + 78125)

/* C program to check whether a number entered by user is Armstrong or not. */

#include <stdio.h>
int main()
{
  int n, n1, rem, num=0;
  printf("Enter a positive  integer: ");
  scanf("%d", &n);
  n1=n;
  while(n1!=0)
  {
      rem=n1%10;
      num+=rem*rem*rem;
      n1/=10;
  }
  if(num==n)
    printf("%d is an Armstrong number.",n);
  else
    printf("%d is not an Armstrong number.",n);
}