inheritance problem!!

[shahbazsaleem]

In the below code i can't understand highlighted code...

#include<iostream>
#include<conio.h>
#include<Windows.h>
using namespace std;
class A
{
protected:
int data;
public:
void show()
{
data=2;//cout<<data;

}
};

class B : public A
{
public:
B(const A &a): A(a) //explain this line please
{

cout<<data;
}
};

int main()
{
A a;
a.show();
B b = a;
getch();
return 0;
}

[Zhuge]

That's using an initializer list to use a particular constructor of A when initializing the A portion of a B.

[shahbazsaleem]

if i want to change the value of data of object a through object B how it is possible???

[Zhuge]

You mean change the value of a member B inherits from A? You can just access it like a normal member (assuming access is allowed).