Example: Sum of Digits - Iterative Method in C++

C
C++
C#
Java
Python
PHP
// Sum of Digits - Iterative Method
#include <iostream>
using namespace std;

int main() {
    int number;
    int sum = 0;
    
    // Step 1: Prompt user for input
    cout << "Enter an integer number: ";
    cin >> number;

    // Step 2: Handle negative numbers by converting to positive
    int tempNumber = number;
    if (tempNumber < 0) {
        tempNumber = -tempNumber;
    }

    // Step 3: Iterate using a while loop to sum digits
    while (tempNumber > 0) {
        int digit = tempNumber % 10; // Get the last digit
        sum += digit;                // Add digit to sum
        tempNumber /= 10;            // Remove the last digit
    }

    // Step 4: Display the result
    cout << "The sum of the digits of " << number << " is: " << sum << endl;
    
    return 0;
}