Question

How to calculate the sum of first N natural numbers in C#

Answer 1

using System;

// 1 + 2 + 3 + 4 + ... + N

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = 10, sum = 0;

            while (n > 0)
            {
                sum += n;
                n--;
            }

            Console.WriteLine("The sum is: {0}", sum);
        }
    }
}

/*
run:
    
The sum is: 55
   
*/

 

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Answer 2

using System;

// 1 + 2 + 3 + 4 + ... + N

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = 10, sum = 0;

            sum = n / 2 * (n + 1);

            Console.WriteLine("The sum is: {0}", sum);
        }
    }
}

/*
run:
    
The sum is: 55
   
*/

 

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