Question

Write a C++ Program that simulates a basic calculator using functions which performs the operations of Addition, Subtraction, multiplication, and Division. ( make sure you cover the case to avoid division by a zero)

1. Display a menu for list of operations that can be calculated and get the input from user about his choice of calculation.
2. Based on user choice of operation, take the input of number/numbers from user. Assume all input values are of type double.
3. Calculations must be implemented using functions which return a double value.
4. Result of the calculation should be displayed on the scree

Important notes: It has to be in C++ program

Answer 1

#include<iostream>

using namespace std;

double addition(double x, double y)

{

    return x + y;

}

double subtraction(double x, double y)

{

    return x - y;

}

double multiplication(double x, double y)

{

    return x * y;

}

double division(double x, double y)

{

    // division by 0 is not defined

    if( y == 0.0 )

        return 0.0;

   

    return x / y;

}

int main()

{

    double x, y, ans;

   

    // infinite loop

    while(1)

    {

        cout<<"Enter 2 numbers : ";

       

        // get user input

        cin>>x>>y;

       

        cout<<"\nSelect an option ...\n";

        cout<<"1. Addition\n";

        cout<<"2. Subtraction\n";

        cout<<"3. Multiplication\n";

        cout<<"4. Division\n";

        cout<<"5. exit\n";

       

        int ch;

       

        // get user input

        cin>>ch;

       

        // addition

        if( ch == 1 )

        {

            double ans = addition(x, y);

           

            cout<<x<<" + "<<y<<" : "<<ans<<endl;

        }

        // subtraction

        else if( ch == 2 )

        {

            double ans = subtraction(x, y);

           

            cout<<x<<" - "<<y<<" : "<<ans<<endl;

        }

        // multiplication

        else if( ch == 3 )

        {

            double ans = multiplication(x, y);

           

            cout<<x<<" * "<<y<<" : "<<ans<<endl;

        }

        // division

        else if( ch == 4 )

        {

            double ans = division(x, y);

           

            cout<<x<<" / "<<y<<" : "<<ans<<endl;

        }

        else

            break;

       

        cout<<endl;

    }

   

    return 0;

}

Sample Output