Passing Object To Function In C++ | Passing Object To Function With Arguments | Passing Object To Function In C++ In Hindi

Passing Object To Function

There are two ways to pass value or data to function in C language, call by value and call by reference. Original value is not modified in call by value but it is modified in call by reference.

1.    Call by value 

2.    Call by reference 

Fig: Passing Object To Function

1.     Call by value

In call by value, value being passed to the function is locally stored by the function parameter in stack memory location. If you change the value of function parameter, it is changed for the current function only. It will not change the value of variable inside the caller method such as main().

Program:

#include<iostream.h>

#include<conio.h>

void addone(int x);

void main()

{

int i;

cout<<”input one number”;

cin>>i;

addone(i);

getch();

}

void addone(int x)

{

x=x+1;

cout<<x;

}

Output:

Input one number 90

91

 

2.call by reference

In call by reference, original value is modified because we pass reference (address). Address of the value is passed in the function, so actual and formal arguments share the same address space.Value changed inside the function, is reflected inside as well as outside the function.

Program:

#include<iostream.h>

#include<conio.h>

void addone(int &x);

void main()

{

int i;

cout<<”input one number”;

cin>>i;

addone(i);

getch();

}

void addone(int &x)

{

x=x+1;

cout<<x;

}

Output:

Input one number 89

90