Default Constructor

Default constructor is the constructor which doesn’t take any argument. It has no parameters.

// Cpp program to illustrate the
// concept of Constructors
#include <iostream>
using namespace std;

class construct
{
public:
int a, b;

// Default Constructor
construct()
{
a = 10;
b = 20;
}
};

int main()
{
// Default constructor called automatically
// when the object is created
construct c;
cout << "a: " << c.a << endl
<< "b: " << c.b;
return 1;
}