#include <iostream>
#include <iomanip>
#include <conio.h>
#include <fstream>

int addition();
int substract();
int multiplication();
int division();
int info();


using namespace std;
int main()
{
      

      int a, b;

      system("cls");
      
      
      cout << "List: " << endl;
      cout << "1: Addition" << endl << "2: Substraction" << endl << "3: Multiplication" << endl << "4: Division" << endl << "5: Info" << endl << "6: Exit" << endl;
      cout << "Chose what to do: ";
      cin >> a;
      cout << endl;

      switch(a)
      {
      case 1:
           addition();
           break;
           
      case 2:
           substract();
           break;
           
      case 3:
           multiplication();
           break;
           
      case 4:
          division();
           break;
      
      case 5:
           info();
           break;
      case 6:
           void exit (int exitcode);
           
      default:
             main();
             break;
             }
             
        
}


int addition()
{
           
     int a, b;
                 
                 
     cout << setw(12) << "Addition" << endl;
     cout << "First number ";
     cin >> a;
     cout << "Second number ";
     cin >> b;
     cout << a << " + " << b << " = " << a+b << endl;


  ofstream myfile;
  myfile.open ("Calculator.txt",ios::app);
  myfile << a << " + " << b << "= " << a+b << "\n";
  myfile.close();

     cout << endl << endl;
     cout << "Press any key to go back to the menu.";
     getch();
     main();

                
}
   
int substract()
{

    int a, b;
     
    cout << setw(4) << "Substraction" << endl;
    cout << "First number ";
    cin >> a;
    cout << "Second number ";
    cin >> b;
    cout << a << " - " << b << " = " << a-b << endl;
    
  ofstream myfile;
  myfile.open ("Calculator.txt",ios::app);
  myfile << a << " - " << b << "= " << a-b << "\n";
  myfile.close();
    
    cout << "Press any key to go back to the menu.";
    getch();
    main();
}

int multiplication()
{
    
    int a, b;
    
    cout << setw(4) << "Multiplication" << endl;
    cout << "First number ";
    cin >> a;
    cout << "Second number ";
    cin >> b;
    cout << a << " * " << b << " = " << a*b << endl;

  ofstream myfile;
  myfile.open ("Calculator.txt",ios::app);
  myfile << a << " * " << b << "= " << a*b << "\n";
  myfile.close();
    
    cout << "Press any key to go back to the menu.";
    getch();
    main();    
}

int division()
{
    int a, b;
    
    cout << setw(4) << "Division" << endl;
    cout << "First number ";
    cin >> a;
    cout << "Second number ";
    cin >> b;
    cout << a << " / " << b << " = " << a/b << endl;
    
  ofstream myfile;
  myfile.open ("Calculator.txt",ios::app);
  myfile << a << " / " << b << "= " << a/b << "\n";
  myfile.close();
    
    cout << "Press any key to go back to the menu.";
    getch();
    main();
        
}

int info()
{
    cout << "At the moment this program don't have any command to exit, so to exist you have to press the x-button on the upper right corner. \n\nSecond; this program don't have to many options to use several different \nnumbers or operators at once, so instead all your data is saved in a text \ndocument in the same folder as your exe-file is." << endl << endl;
    cout << "Press any key to go back to the menu.";
    getch();
    main();
}