Write a program that will demonstrate nested member function

Write a program that will demonstrate nested member function. The program that uses the following properties - class name- addnumber, integer type private member variable- a, b; three member function inputnumber(), int add(), show(). add() function will add the inputted value a, b like int x=a+b. show() function will call the add() function as a nested function and will display the addition value y as output.

#include <iostream>

using namespace std;

class addnumber

{

private:

                int a,b;

public:

                void inputnumber(void);

                int add(void);

                void show(void);

};

void addnumber :: inputnumber(void)

{

                cin >> a >> b;

}

int addnumber :: add(void)

{

                int x=a+b;

                return(x);

}

void addnumber :: show(void)

{

                cout << add();

}

int main()

{

                addnumber result;

                result.inputnumber();

                result.show();

                return 0;

}