C# - out parameters and reference parameters, C#

C# - out parameters and reference parameters

//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

/*
    BEFORE PROCEEDING WITH THIS EXAMPLE,YOU'RE HIGHLY RECOMMENDED TO SEE THE CODE OF A C# METHOD THAT ACCEPTS AN INDEFINITE NUMBER OF PARAMETERS HERE:
    http://rextester.com/ICWH47686
*/
using System;

namespace Rextester
{
    public class Operations
    {
        public static void SumUsingRef(ref int result,params int[] numbers)
        {
            for (int i=0;i<numbers.Length;i++) 
            {
                result += numbers[i];
            }
        }
        
        public static void SumUsingOut(out int result,params int[] numbers)
        {
            result=0; //when using "out" parameters,you should initialize all the out parameters
            for (int i=0;i<numbers.Length;i++) 
            {
                result += numbers[i];
            }
        }
    }
    
    public class Program
    {
        public static void Main(string[] args)
        {
            int result1=0; //note that in reference parameters,you might initialize the variable with any value you want
            Operations.SumUsingRef(ref result1,9,8,7);
            Console.WriteLine(result1);
            
            int result2; //here,even if you initialized result2 with any value you want,the method will always initialize it to zero
            Operations.SumUsingOut(out result2,9,8,7);
            Console.WriteLine(result2);
        }
    }
}


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