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How to assign a reference to a variable in C#
To assign reference to a variable, use the ref keyword. A reference parameter is a reference to a memory location of a variable. When you pass parameters by reference, unlike value parameters, a new storage location is not created for these parameters. Declare the reference parameters using the ref keyword.
Let us see an example −
Here, we are swapping two values using the ref keyword −
Example
using System;
namespace Demo {
class Program {
public void swap(ref int x, ref int y) {
int temp;
temp = x; /* save the value of x */
x = y; /* put y into x */
y = temp; /* put temp into y */
}
static void Main(string[] args) {
Program p = new Program();
/* local variable definition */
int a = 99;
int b = 110;
Console.WriteLine("Before swap, value of a : {0}", a);
Console.WriteLine("Before swap, value of b : {0}", b);
/* calling a function to swap the values */
p.swap(ref a, ref b);
Console.WriteLine("After swap, value of a : {0}", a);
Console.WriteLine("After swap, value of b : {0}", b);
Console.ReadLine();
}
}
}Output
Before swap, value of a : 99 Before swap, value of b : 110 After swap, value of a : 110 After swap, value of b : 99
Updated on: 20-Jun-2020
4K+ Views
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