Question

How to find the sum of all the multiples of 3 or 5 below 1000 in C#

Answer 1

using System;

class Program
{
    static void Main()
    {
        int sum = 0;
        
        for (int i = 1; i < 1000; i++) {
            if (i % 3 == 0 || i % 5 == 0) {
                sum += i;
            }
        }
        
        Console.WriteLine("The sum of all multiples of 3 or 5 below 1000 is: " + sum);
    }
}

   
   
/*
run:
   
The sum of all multiples of 3 or 5 below 1000 is: 233168
   
*/

 

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Answer 2

using System;
using System.Linq;

class Program
{
    static void Main()
    {
        int sum = Enumerable.Range(0, 1000)
                            .Where(x => x % 3 == 0 || x % 5 == 0)
                            .Sum();

        Console.WriteLine(sum);
    }
}

   
   
/*
run:
   
233168
   
*/

 

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