Program to Check Armstrong Number

An Armstrong number is a positive integer for which the sum of 'n'th power of its digits is equal to the number itself where n is the number of digits in the number. This is a c program to check whether a given number is an Armstrong number or not. For example, 153 is a 3 digit Armstrong number because 1³+5³+3³=153.

# include <stdio.h>
# include <conio.h>
# include <math.h>
void main ()
{
int a,b=0,sum=0;
long int n;
printf("Enter the number to check\n ");
scanf("%i",&n);
if(n<1)
{
printf ("\nThe number should be greater than 0");
}
else
{
a=n;
//counting the digits
while (a>0)
  {
  a=a/10;
  b++;
  }
a=n;
//adding up bth power of digits
while(a>0)
  {
  sum=sum+pow(( a%10) ,b);
  a=a/10;
  }
if(sum==n)
  printf ("\nThe number is an ARMSTRONG number");
else
  printf ("\nThe number is NOT an ARMSTRONG number");
}
getch();
}