C Program to Check Armstrong Number

Before writing the the C program to check Armstrong Number, lets see what is Armstrong number.

An Armstrong number of three digits is an integer such that the sum of the cubes of its digits is equal to the number itself.

For Example, 153, 371 are Armstrong number. Lets see why

153 = (1)3 + (5)3 + (3)3
153 = 1 + 125 + 27
153 = 153

371 = (3*3*3)+(7*7*7)+(1*1*1)  
(3*3*3)=27  
(7*7*7)=343  
(1*1*1)=1  
So:  
27+343+1=371

Now let see the C Program to Check Armstrong Number

#include <stdio.h>

int main() {
   int arms = 153; 
   int check, rem, sum = 0;

   check = arms;

   while(check != 0) {
      rem = check % 10;
      sum = sum + (rem * rem * rem);
      check = check / 10;
   }

   if(sum == arms) 
      printf("%d is an armstrong number.", arms);
   else 
      printf("%d is not an armstrong number.", arms);
      
   return 0;
}

Output of the program should be

153 is an armstrong number.

Also check the Factorial Program in C