CS Out Parameter

C# offers keywords as out-type for passing arguments. Only one value can be returned in a function with a return statement. But we can return two values from a function using the output parameters. Output parameters are similar to the reference parameters, with the exception that data are transferred from the method rather than into it.

 

 

Example:

using System;
namespace OutParameter
{
    class Program
    {
        // User defined function  
        public void Display(out int val) // Out parameter  
        {
            int square = 10;
            val = square;
            val *= val; // Manipulating value  
        }
        // Main function, execution entry point of the program  
        static void Main(string[] args)
        {
            int val = 20;
            Program program = new Program(); // Creating Object  
            Console.WriteLine("Value before passing out variable " + val);
            program.Display(out val); // Passing out argument  
            Console.WriteLine("Value after recieving the out variable " + val);
        }
    }
}

 

Output:

Value before passing out variable 20
Value after recieving the out variable 100

 

The example below shows how a function can return several values.

Example:

using System;
namespace OutParameter
{
    class Program
    {
        // User defined function  
        public void Display(out int a, out int b) // Out parameter  
        {
            int square = 5;
            a = square;
            b = square;
            // Manipulating value  
            a *= a;
            b *= b;
        }
        // Main function, execution entry point of the program  
        static void Main(string[] args)
        {
            int val1 = 20, val2 = 50;
            Program program = new Program(); // Creating Object  
            Console.WriteLine("Value before passing \n val1 = " + val1 + " \n val2 = " + val2);
            program.Display(out val1, out val2); // Passing out argument  
            Console.WriteLine("Value after passing \n val1 = " + val1 + " \n val2 = " + val2);
        }
    }
}

Output:

Value before passing
val1 = 20
val2 = 50
Value after passing
val1 = 25
val2 = 25