Simple Example Program For Copy Constructor In C++
Constructor Definition
A constructor is a special member function of the class which has the same name as that of the class. It is automatically invoked when we declare/create new objects of the class.
- A constructor should have the same name as that of the class.
- It should be a public member.
- A constructor does not have any return values.
- A constructor can be overloaded.
for better Understanding,
Copy Constructor:
A copy constructor is a like a normal parameterized Constructor, but which parameter is the same class object. Copy constructor uses to initialize an object using another object of the same class.
Syntax
class class_name {
public:
class_name(class_name & obj) {
// obj is same class another object
// Copy Constructor code
}
//... other Variables & Functions
}
Syntax: Copy Constructor Declaration In Main Function
// In Main Function
class_name object1(params);
Method 1 - Copy Constrcutor
class_name object2(object1);
Method 2 - Copy Constrcutor
class_name object3 = object1;
Copy Constructor Example Program
/* Example Program For Simple Example Program Of Copy Constructor Overloading In C++
little drops @ thiyagaraaj.com
Coded By:THIYAGARAAJ MP */
#include<iostream>
#include<conio.h>
using namespace std;
class Example {
// Member Variable Declaration
int a, b;
public:
//Normal Constructor with Argument
Example(int x, int y) {
// Assign Values In Constructor
a = x;
b = y;
cout << "\nIm Constructor";
}
//Copy Constructor with Obj Argument
Example(const Example& obj) {
// Assign Values In Constructor
a = obj.a;
b = obj.b;
cout << "\nIm Copy Constructor";
}
void Display() {
cout << "\nValues :" << a << "\t" << b;
}
};
int main() {
//Normal Constructor Invoked
Example Object(10, 20);
//Copy Constructor Invoked - Method 1
Example Object2(Object);
//Copy Constructor Invoked - Method 2
Example Object3 = Object;
Object.Display();
Object2.Display();
Object3.Display();
// Wait For Output Screen
getch();
return 0;
}
Sample Output
Im Constructor
Im Copy Constructor
Im Copy Constructor
Values :10 20
Values :10 20
Values :10 20
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