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use of out parameter in c#

Sushant Mishra 1338 25-Aug-2017

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

Updated on 25-Aug-2017

Sushant Mishra

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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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use of out parameter in c#

Sushant Mishra

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