Constructor in Inheritance

2

Constructor in InheritanceConstructors are used to initialized object.In inheritance the base class contains default constructor then, the base class constructor is

automatically calledclass A{

protected: int a;public: A(){a=10;}

};class B:public A{

public:void show(){cout<<a;}

};void main(){

B obj;obj.show();

}

3

Constructor in InheritanceIf base class contains parameterized constructor then the derived

class must have constructor ;Through the derived class constructor we can call base class

constructor.In main() we are creating object of only derived class, then

derived class constructor will call base class constructorThe derived class constructor function definition contains two part derived class constructor(arglist): initialization section{

constructor body;}colon separates the constructor declaration of the derived class

from the base class constructor.

4

Constructor in Inheritanceclass A{

protected:int a;public: A(int x){a=x;}

};class B:public A{

int b;public:B(int x,int y):A(x){b=y;}void show(){cout<<a<<" "<<b;}

};

void main(){

B obj(1,2);obj.show();

}

5

Constructor in InheritanceIn multiple inheritance

derived(int x,int y,int z):A(x),B(y){

c=z;}