C++ Simple calculator Examples

C++ Simple calculator Examples

#include<iostream>
#include<cmath>

using namespace std;

int main()
{

    double num1,num2;
    char operation,redo;

    cout<<"Welcome to the calculater program v.1.0 written by Your Name"<<endl;
    cout<<"***************************************************************"<<endl;
    cout<<endl<<endl<<endl;

    do
    {
        cout<<" Please enter an operation which you like to calculate (+,-,*,/,s)";
        cout<<"[s stands for swap]:";
        cin>>operation ;
        cout<<endl<<endl;
        cout<<" Please enter two numbers to apply your requested operation(";
        cout<<operation<<"):"<<endl<<"1st num:";
        cin>>num1;
        cout<<"2nd num:" ;
        cin>>num2;
        cout<<endl;
        switch (operation)
        {

        case'+':
            cout<<"The addition of two numbers ("<<num1<<","<<num2<<"):";
            cout<<num1+num2<<endl;
            break;
        case'-':
            cout<<"The substraction of two numbers ("<<num1<<","<<num2<<"):";
            cout<<num1-num2<<endl;
            break;
        case'*':
            cout<<"The multiplication of two numbers ("<<num1<<","<<num2<<"):";
            cout<<num1*num2<<endl;
            break;
        case'/':
            cout<<"The division of two numbers ("<<num1<<","<<num2<<"):";
            if(num2==0)
            {
                cout<<"not valid"<<endl;
            }
            cout<<(num1/num2)<<endl;
            break;
        case's':
            cout<<"The swap of two numbers ("<<num1<<","<<num2<<"):";
            swap(num1,num2);
            cout<<"1stnumber="<<num1<<"and 2nd number="<<num2<<endl<<endl;
            break;
        default:
            cout<<"unknown command"<<endl;

        }

        cout<<"enter y or Y to continue:";
        cin>>redo;
        cout<<endl<<endl;
    }
    while(redo=='y'||redo=='Y');

    return 0;

}

Output