Question

create a calculator using C++ (OOP) with all operations and contain round and square parentheses and it supports the following operations: addition, subtraction, multiplication, division, power, nth root use a minimum of 4 classes, should contain at for invalid expressions the calculator will display an error message - All the attributes will have getters and setters; the setters will contain validations. Each class will have at least two operators overloaded from the following ones (the same operator will not be overloaded for two different classes):

• index operator []
• an implicit or explicit cast
• a conditional operator (<.>,=<,>=,==)

For examples of inputs:

1- [4+(5-1)]*2 should output 16

2- 5 / 0 will display an error because division to 0 does not make sense

The calculator will take the input from the console. The user will have the ability to write equations and entering the app will display the result.

Answer 1

#include <iostream>

using namespace std;

  

// Main program

main()

{

    char op;

    float num1, num2;

  

    // It allows user to enter operator i.e. +, -, *, /

    cin >> op;

  

    // It allow user to enter the operands

    cin >> num1 >> num2;

  

    // Switch statement begins

    switch (op) {

          

        // If user enter + 

        case '+':

            cout << num1 + num2;

            break;

          

        // If user enter - 

        case '-':

            cout << num1 - num2;

            break;

          

        // If user enter *

        case '*':

            cout << num1 * num2;

            break;

          

        // If user enter /

        case '/':

            cout << num1 / num2;

            break;

          

        // If the operator is other than +, -, * or /, 

        // error message will display

        default:

            cout << "Error! operator is not correct";

            break;

    } // switch statement ends

  

    return 0; 

}