Here we will learn how to write a C program inorder to check the given number is ARMSTRONG or not.
C program to find Armstrong number
C PROGRAM TO CHECK GIVEN NUMBER IS ARMSTRONG NUMBER OR NOT

/**
C PROGRAM TO CHECK GIVEN NUMBER IS ARMSTRONG NUMBER OR NOT by codebind.com
*/

#include <stdio.h>



int Power(int n, int r) {
   int c, p = 1;

   for (c = 1; c <= r; c++)
      p = p*n;

   return p;
}

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

   printf("Input an integer : \n");
   scanf("%d", &n);

   temp = n;
   // Count number of digits
   while (temp != 0) {
      digits++;
      temp = temp/10;
   }

   temp = n;

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

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

   return 0;
}


/*
OUTPUT:
Input an integer :
1620
1620 is not an Armstrong number.


*/