Constructor Overloading in C++

Last Updated : 14 Sep, 2023

Prerequisites: Constructors in C++
In C++, We can have more than one constructor in a class with same name, as long as each has a different list of arguments.This concept is known as Constructor Overloading and is quite similar to function overloading.

Overloaded constructors essentially have the same name (exact name of the class) and different by number and type of arguments.
A constructor is called depending upon the number and type of arguments passed.
While creating the object, arguments must be passed to let compiler know, which constructor needs to be called.

CPP

// C++ program to illustrate 
// Constructor overloading
#include <iostream>
using namespace std;

class construct
{ 

public:
    float area; 
    
    // Constructor with no parameters
    construct()
    {
        area = 0;
    }
    
    // Constructor with two parameters
    construct(int a, int b)
    {
        area = a * b;
    }
    
    void disp()
    {
        cout<< area<< endl;
    }
};

int main()
{
    // Constructor Overloading 
    // with two different constructors
    // of class name
    construct o;
    construct o2( 10, 20);
    
    o.disp();
    o2.disp();
    return 1;
}

Output:

0
200

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This article is contributed by I.HARISH KUMAR.

Functions that cannot be overloaded in C++

I.HARISH KUMAR

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