Check Armstrong Number

Giovanny Gongora

Check whether an integer entered by the user is an Armstrong number or not. A positive integer is called an Armstrong number (of order n) if

abcd... = an + bn + cn + dn +

In the case of an Armstrong number of 3 digits, the sum of cubes of each digit is equal to the number itself. For example, 153 is an Armstrong number because

153 = 1*1*1 + 5*5*5 + 3*3*3

#include <stdio.h>

int armstrongNumber() {
  int num, originalNum, remainder, result = 0;
  printf("Enter a three-digit integer: ");
  scanf("%d", &num);
  originalNum = num;
  while (originalNum != 0) {
    // remainder contains the last digit
    remainder = originalNum % 10;
    result += remainder * remainder * remainder;
    // removing last digit from the orignal number
    originalNum /= 10;
  }
  if (result == num)
    printf("%d is an Armstrong number.", num);
  else
    printf("%d is not an Armstrong number.", num);
  return 0;
}