Calculator

#include<bits/stdc++.h>
using namespace std;

class Calculator
{
    public:
    void addition(double a,double b)
    {
        cout<<"The result of addition "<<a+b<<endl;
    }
    void  subtraction(double a,double b)
    {
        cout<<"The result of subtraction "<<a-b<<endl;
    }
    void multiplication(double a,double b)
    {
        cout<<"The result of multiplication "<<a*b<<endl;
    }
    void division(double a,double b)
    {
        if(b==0)
        {
            cout<<"Undefined"<<endl;
        }
        else
        {
            cout<<"The result of division "<<a/b<<endl;
        }
    }

};


int main()
{

    while(true)
    {
        Calculator calc;
        char c;
        cout<<"Enter your choice"<<endl;
        cout<<"+ for addition"<<endl;
        cout<<"- for subtraction"<<endl;
        cout<<"* for multiplication"<<endl;
        cout<<"/ for division"<<endl;
        cout<<"e/E for Exit"<<endl;
        cin>>c;
        if(c=='+')
        {
            cout<<"Enter two numbers"<<endl;
            double a,b;
            cin>>a>>b;
            calc.addition(a,b);
        }
        else if(c=='-')
        {
             cout<<"Enter two numbers"<<endl;
            double a,b;
            cin>>a>>b;
            calc.subtraction(a,b);
        }
        else if(c=='*')
        {
             cout<<"Enter two numbers"<<endl;
            double a,b;
            cin>>a>>b;
            calc.multiplication(a,b);
        }
        else if(c=='/')
        {
             cout<<"Enter two numbers"<<endl;
            double a,b;
            cin>>a>>b;
            calc.division(a,b);
        }
        else if(c=='e' || c=='E')
        {
            break;
        }
        else
        {
            cout<<"Invalid choice"<<endl;
            cout<<"Enter again"<<endl;
        }
    }
    return 0;
}