Out parameter and normal parameter difference?

Prathap

11y1.1kVisual Basic .NET

What is the difference between Out parameter and a normal parameter in c#

7 Replies

Know the answer? Post it — somebody with the same question will find it here.

Pankaj Kumar Choudhary11y ago
Hello @Partap

Out parameter are reference type and normal parameter are value type.
Mainly Out parameters are use for return more than one value from function
Jaipal Reddy11y ago
Out Parameter

If you want to pass a variable as out parameter you don’t need to initialize it before you pass it as out parameter to method. Out keyword also will pass parameter as a reference but here out parameter must be initialized in called method before it return value to calling method.

Declaration of Out Parameter

Generally we will use out parameters like as shown below

int i,j; // No need to initialize variable
Outsample(out i, out j);

If you observe above code first we declared variable and we it pass a out parameter to Outsample method without initialize the values to variables
Upendra Pratap Shahi11y ago
out (Output) Parameter
Output parameter is used to pass the result back to the calling function. ‘out’ keyword is used to declare the parameter as an Output parameter. Similar to a reference parameter, an output parameter does not create a new storage location. Instead, it becomes an alias to the parameter in the calling method.
Example of out Parameter
1
2
3
4
5
6
7
8
9
10
11
12
13
using System;
class MyOutput
{
static void Square(int p, out int q)
{
q=p*p;
}
public static void main()
{
int x;
Square(5, out x);
Console.WriteLine("Square of a no. is : "+x);
}}
In the above program, x is declared as an out parameter in calling function and as you can see, x has not been initialized. When Square function terminates, the value of q will be copied to the output parameter x.
Parameter

is variable in the declaration of function
Rajeesh Menoth11y ago
Welcome Prathap, accept any of the answer then only another person know the correct solution...
Prathap11y ago
Thanks Rajeesh Menoth , Vignesh Mani
Vignesh Mani11y ago
You should assign the value for normal parameter before pass as a argument but you need not assign value for out parameter.
Rajeesh Menoth11y ago
Parameter

is variable in the declaration of function

Out Parameter
If you want to pass a variable as out parameter you don’t need to initialize it before you pass it as out parameter to method. Out keyword also will pass parameter as a reference but here out parameter must be initialized in called method before it return value to calling method.