use of out parameter in c#

Sushant Mishra 1563 25 Aug 2017

i have little confujion in out keyword, where we use this, please give an example

Ask by Sushant Mishra

Updated 25 Aug 2017

1 Answers

Niraj Kumar Mishra 25 Aug 2017

when you are want to return any value from any method then you are use return keyword. But return keyword return only one value at a time.
Let see in Example:

using System;
 class Program
 {  
   public static void Main()
   {
      int result = 0;
      result = Add(10, 20);
      Console.WriteLine("Sum={0} ", result);
      Console.ReadKey();
   }
   
   public static int Add(int FN, int SN)
   {
     return FN + SN;
   }
 }

in this example method Add return a single value.

But at the same time i want to return more than one value from a method then return not do this operation.

So, that place we use out keyword.

Because out keyword used when you want a method to return more than one value.

Let see in below example

Example: I have a method Calculate and i want to it return two value first is Sum and second is Subtract of numbers

using System;
class Program
{
   public static void Main()
   {
       int Total = 0;
       int Subtract= 0;
       Calculate(10, 20, out Total, out Subtract);
       Console.WriteLine("Sum={0} &&Subtract={1}",Total,Subtract);
       Console.ReadKey();
   }
   
   public static void Calculate(int FN,int SN,out int Sum,out int Subtract)
   {
       Sum = FN + SN;
       Subtract= FN - SN;
   }
}

OUTPUT:

I hope you are understand this.

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