C - Programming Guide

 C - Program for Check if a Number is Armstrong Number

#include <stdio.h>

main()
{
   int number, sum = 0, temp, remainder;

   printf("\n Enter a number :: ");     
   scanf("%d",&number);

   temp = number;

   while( temp != 0 )
   {
      remainder = temp%10;
      sum = sum + remainder*remainder*remainder;
      temp = temp/10;
   }

   if ( number == sum )
      printf("\n Entered number is an Armstrong number.");
   else
      printf("\n Entered number is not an Armstrong number.");        

   return 0;
}