What is constructor overloading in CPP?

Question

https://www.sololearn.com/discuss/2052876/?ref=app

Answer 1

Constructor overloading is a concept of having more than one constructor with different parameters list
Example:

#include <iostream>
using namespace std;
class ABC
{
private: int x,y;
public:
ABC ()
{
x = y = 0;
}
ABC(int a)
{
x = y = a;
}
ABC(int a,int b)
{
x = a; y = b;
}
void display()
{
cout << "x = " << x << "y = " << y <<endl;
}
};
int main()
{
ABC cc1;
cc2(10);
cc3(10,20);
cc1.display();
cc2.display();
cc3.display();
return 0;
}

Answer 2

Komal
Please avoid inclusion of links having no relevance to the main question. The linked question subject was about structure not class constructor : )

Answer 3

See when you create a class, then the default constructor is also created by itself. To overload a constructor you just have to pass different parameters or no parameters for eg-
class Number{
public:
int x,y;
Number(int x, int y){
this.x = x;
this.y = y;
} // Default constructor

Number(){
cout << "I print numbers" << endl;
} // Constructor overloaded
}
So in the main method when you try to create an instance of the class then don't pass any parameter to it and it will ultimately call the overloaded constructor. Always remember that the constructor is called when an object is created of that class.

Answer 4

Rohit Gupta💻
What is the type of variable <cc2> and <cc3>? why you didn't specify the type for these objects?