(C++) Creating a Calculator Program[using Classes, this, const, array, if-else, do-while, QuitYesOrNo)

This Calculator program uses Classes,this,const,array,if-else, do-while, QuitOption

#include <iostream>



using namespace std;



class arithmetic {

private:

double a;

double b;

double x;



public:

//constructors

arithmetic(){}

arithmetic(double, double, double);



//Functions

double userInput();

double calculate();

void display();



//using 'this' for variables that will only be declared later. "this" is a pointer to a class member only.

void setA(double a){this->a=a;}

double getA(){return a;}



void setB(double b){this->b=b;}

double getB(){return b;}



void setX(double x){this->x=x;}

double getX(){return x;}

};



double arithmetic::userInput() {

cout<< "Type in your first number: "<<endl;

cin>>a;

cout<< "Type in your second number: "<<endl;

cin>>b;



//Error Check

while(cin.good()==false) {



//report error and clear stream

cout<< "Error. Type numbers only!" << endl;

cin.clear();

cin.ignore(INT_MAX, '\n');



//get input again

cout<< "Type in your first number: "<<endl;

cin>>a;

cout<< "Type in your second number: "<<endl;

cin>>b;



}



return a;

return b;

}



double arithmetic::calculate() {



//Menu

cout<< "Choose 1 for addition: "<< endl;

cout<< "Choose 2 for subtraction: "<< endl;

cout<< "Choose 3 for multiplication: "<< endl;

cout<< "Choose 4 for division: "<< endl;



//User using array to choose the operation they want

const int size=4;

int array[size]= {1,2,3,4};

cin>>array[size];



if(array[size]==1){x=a+b; return x;}

else if(array[size]==2){x=a-b; return x;}

else if(array[size]==3){x=a*b; return x;}

else {x=a/b; return x;}



}



void arithmetic:: display() {

cout<< "Your first number is: "<<a<<endl;

cout<< "Your second number is: "<<b<<endl;

cout<< "The result is: "<<x<<endl;



}





int main() {

arithmetic result; //invoking the class

result.userInput();

result.calculate();

result.display();

//Do you want to re-run the program?
char choice;
    bool run = true;
    while(run)
    {
        // Make your calculation
        do{
   cout<<"Would you like to perform other calculation?(Y/N)"<<endl;
   cin >> choice;
   choice = tolower(choice);//Put your letter to its lower case
        
}while (choice != 'n' && choice != 'y'); {
        if(choice =='n'){
            run = false;
            break;
        }
    }
arithmetic result; //invoking the class

result.userInput();

result.calculate();

result.display();

    }


return 0;

}

© 2019 Fadly.M.H.Wychowvski