Question

#include<iostream>
using namespace std;
class add //Specifies the class
{
private:
int iNum1, iNum2, iNum3; //Member data
public:
void input(int iVar1, int iVar2) //Member function
{
cout<<"Functions to assign values to the member data"<<endl;
iNum1=iVar1;
iNum2=iVar2;
}
void sum(void) //Member function
{
cout<<"Functions to find the sum of two numbers"<<endl;
iNum3=iNum1+iNum2;
}
void disp(void) //Member function
{
cout<<"The sum of the two numbers is "<<iNum3<<endl;
}
};
/////////main function of the program///////////
void main()
{
add A1;
int iX, iY;
cout<<"Input two numbers"<<endl;
cin>>iX;
cin>>iY;
A1.input(iX, iY);
A1.sum();
A1.disp();
system("pause");
}
Code the example given above and include a private constructor in the class. Create
objects of this class. Test the code and write down how the constructor will be called
or unable to be called?

Answer 1

The private constructor can be called in the main function by making the main() function a friend function the class add.

This is shown below:

#include<iostream>


using namespace std;


class add //Specifies the class


{


private:
add(){
	
}
int iNum1, iNum2, iNum3; //Member data
add(int a, int b, int c){
	iNum1  =a;
	iNum2  =b;
	iNum3  =c;
}
public:
friend int main();
void input(int iVar1, int iVar2) //Member function


{


cout<<"Functions to assign values to the member data"<<endl;


iNum1=iVar1;


iNum2=iVar2;


}


void sum(void) //Member function


{


cout<<"Functions to find the sum of two numbers"<<endl;


iNum3=iNum1+iNum2;


}


void disp(void) //Member function


{


cout<<"The sum of the two numbers is "<<iNum3<<endl;


}


};


/////////main function of the program///////////


int main()


{


add A1;


int iX, iY;


cout<<"Input two numbers"<<endl;


cin>>iX;


cin>>iY;


A1.input(iX, iY);


A1.sum();


A1.disp();


system("pause");


}