Calling function in a programming is a normal case and in c
and c++ it is an art by which one can conquer the heart of these languages.
There are two types of calling which can be done in c and
c++. Call by value and call by reference.
In call by value- simple a value is passed to the other
method and changes made in that value will not be reflected back in calling
function.
In call by reference
- simple a value is passed to the other method and changes made in that value
will be reflected back in calling function.
Int a; call by value call
by reference
a a p a ,p
Calling -method2(a); method3(a)
Receiving –method2(int p) method3(int &p)
Meaning – int p =a; int
p=a; but p memory
Is
same for both.
Void method1()
{
Int a ;
Cout<<enter the value of a”:
Cin>>a;
//Value is passed to
method2 by call by value function
method2(a);
//Value is passed to
method3 by call by reference function
Method3(a);
}
/* value is received in method2 and it will be received like
p=a; any changes occurring in p cannot be reflected in a because both are operating on different blocks*/
void method2(int p)
{
//change in p does not mean change in a
P=p+1;
Cout<<p;
}
/* value is received in method3 and it will received like
p=a; any changes occurring in p will be reflected in a because both are operating on same same block */
Void method3(int &p)
{
// change in p means change in a
P=p+1;
Cout<<p;
}
