Ref and
out key word :-
Ref and
out key word use to passing the value as reference to the function,If
you want to pass a variable as ref parameter you must need to initialize it,
before you pass it as ref parameter to any method. Ref keyword will pass
parameter as a reference this means when the value of parameter is changed in
called method it get reflected in calling method also.
class Refkeyword
{
static void Main()
{
int i; //
variable need to be initialized
i = 3;
Refsamplemethod(ref i);
Console.WriteLine(i);
}
public static void Refsamplemethod
(ref int val1)
{
val1 += 10;
}
}
Properties of ref keyword
:-
- · Must be initialized.
- · Always return the single value.
- · Ref keyword used to pass an argument in a method.
Out Key word
:-
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 .
class OutKeyword
{
static void Main()
{
int i,j; //
No need to initialize variable
Outsample(out i, out j);
Console.WriteLine(i);
Console.WriteLine(j);
}
public static int Outsample(out int val1, out int val2)
{
val1 = 5;
val2 = 10;
return 0;
}
}
Properties of ref keyword
:-
- · No need to initialize.
- · Return the multiple value.
- · Out keyword used to pass an argument in a method.
Note : Out
and Ref work differently at run time but both are same at compile time.
So, if you want to create two functions with the same names and same parameters
but the only difference is Out and Ref keyword, then it will give a compile
time error. We can say overloading is not possible in case of the same
functions and they have only one difference, i.e. Ref and Out keyword.
