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Armstrong Numbers

Checking whether a number equals the sum of the cubes of its individual digits.

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An Armstrong number is a number where adding the cube of all its individual digits sums back up to the number itself. Take 371: 3³ + 7³ + 1³ = 371, so it’s an Armstrong number.

We reuse the digit-extraction logic, cubing each digit as we go, and compare the running sum against the original number:

static void armstrong(int n){
    int duplicate = n; // store the input number in this duplicate variable since n will change on each iteration
    int sum = 0;
    while (n > 0){
        int lastDigit = n % 10;
        sum = sum + (lastDigit * lastDigit * lastDigit); // each digit cubed will be stored into sum
        n = n / 10;
    }
    if ( sum == duplicate){
        return "true";
    } else{
        return "false";
    }
}