# Check Armstrong Number

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Giovanny Gongora

Codiga's C Recipes

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;
}
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