C# Out Parameter

by Online Tutorials Library July 14, 2022

C# Out Parameter

C# provides out keyword to pass arguments as out-type. It is like reference-type, except that it does not require variable to initialize before passing. We must use out keyword to pass argument as out-type. It is useful when we want a function to return multiple values.

C# Out Parameter Example 1

 using System; namespace OutParameter {     class Program     {         // User defined function         public void Show(out int val) // Out parameter         {             int square = 5;             val = square;             val *= val; // Manipulating value         }         // Main function, execution entry point of the program         static void Main(string[] args)         {             int val = 50;             Program program = new Program(); // Creating Object             Console.WriteLine(“Value before passing out variable ” + val);             program.Show(out val); // Passing out argument             Console.WriteLine(“Value after recieving the out variable ” + val);         }     } } 

Output:

Value before passing out variable 50 Value after receiving the out variable 25

The following example demonstrates that how a function can return multiple values.

C# Out Parameter Example 2

 using System; namespace OutParameter {     class Program     {         // User defined function         public void Show(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 = 50, val2 = 100;             Program program = new Program(); // Creating Object             Console.WriteLine(“Value before passing n val1 = ” + val1+” n val2 = “+val2);             program.Show(out val1, out val2); // Passing out argument             Console.WriteLine(“Value after passing n val1 = ” + val1 + ” n val2 = ” + val2);         }     } } 

Output:

Value before passing  val1 = 50  val2 = 100 Value after passing  val1 = 25  val2 = 25

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