Multiples of 3 and 5 | Project Euler | Problem #1

URL to the problem page: https://projecteuler.net/problem=1

If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.

Find the sum of all the multiples of 3 or 5 below 1000.

#include <iostream>

using namespace std;

int main()

{

    int i, number = 0;

    for (i = 1; i < 1000; i++) {

        if (i % 3 == 0 || i % 5 == 0) {

            number += i;

        }

    }

    cout << "Sum of all the multiples of 3 or 5 below 1000 is  =  " << number << endl;

    return 0;

}

CLICK TO SEE THE OUTPUT.