Question

Define a class Calculator and overload (+ , - , * , / , == , ++ , --) operators by using operator overloading concepts? a- User can select operator to perform calculations. b- User give input to data members for operations. c- Overload the constructor for default values. d- Use the concept of (this) operator

Answer 1

#include <iostream>

#include <conio.h>

using namespace std;

class calculator

{

private:

float val;

public:

calculator(): val(0)

{}

void getdata()

{

cout << "enter number: ";

cin >> val;

}

void showdata()

{

cout << "value: " << val << endl;

}

calculator operator + (calculator) const;

calculator operator - (calculator) const;

calculator operator * (calculator) const;

calculator operator / (calculator) const;

};

calculator calculator::operator + (calculator arg2) const

{

calculator temp;

temp.val = val + arg2.val;

return temp;

}

calculator calculator::operator - (calculator arg2) const

{

calculator temp;

temp.val = val - arg2.val;

return temp;

}

calculator calculator::operator * (calculator arg2) const

{

calculator temp;

temp.val = val * arg2.val;

return temp;

}

calculator calculator::operator / (calculator arg2) const

{

calculator temp;

temp.val = val / arg2.val;

return temp;

}

void main()

{

calculator obj1, obj2, obj3;

char ch;

int choice;

obj1.getdata();

cout << "1st value entered: ";

obj1.showdata();

cout << endl;

obj2.getdata();

cout << "2nd value entered: ";

obj2.showdata();

cout << endl;

cout << "Input choice as integer: 1: +, 2: -, 3: *, 4:/ ";

cin >> choice;

cout << endl;

switch (choice)

{

case 1:

obj3 = obj1 + obj2;

break;

case 2:

obj3 = obj1 - obj2;

break;

case 3:

obj3 = obj1 * obj2;

break;

case 4:

obj3 = obj1 / obj2;

break;

default:

cout << "Invalid choice! " << endl;

}

cout << "Result ";

obj3.showdata();

cout << endl;

}