Menu (any default style ? )

**BlackSlash12** · 09-04-2007

I am currently practice to upgrade my (novice) skills and I want to know if there any default/universal way of coding the menu choices. For example:

1. Wake up
2. Sleep
3. Sit Down
4. Take Home
Select you choice:

I thought of this:

Code:

#include <iostream>

using namespace std;

enum CHOICE  {
     Wake = 1,
     Bath,
     Toilet,
     Hack,
     Quit   };

// Function Definition and Prototype

int DoMenu()
{
    int choice;
    
    cout << endl << endl;
    cout << " ***** Menu ***** " <<endl;
    cout << "(1) Wake me up when project ends" << endl;
    cout << "(2) GOTO Bathroom" << endl;
    cout << "(3) fflussh(toilet)" << endl;
    cout << "(4) Hack the kernel" << endl;
    cout << "(5) Quit" << endl;
    
    cin >> choice;
    return choice;
}

int main()
{
    int choice;
    bool fQuit = false;
    
    while (!fQuit)
    {
          choice = DoMenu();
          
          if ( choice < Wake || choice > Quit )
          {
               cout << "Wrong pal";
               cout << endl << endl;
               
               continue;
          }
          
          switch(choice)
          {
                        case Wake:
                             cout << "Drinsane!!! " << endl;
                             break;
                        case Bath:
                             cout << "Please wait while bathing ... " << endl;
                             cout << "You smell sehr gut" << endl;
                             break;
                        case Toilet:
                             break;
                        case Hack:
                             break;
                        case Quit:
                             fQuit = true;
                             cout << "\nExiting .... " << endl << endl;
                             break;
                        default:
                                fQuit = true;
                                cout << "\nExiting .... " << endl << endl;
                                break;
          }
    }
    system("PAUSE");
    return 0;
}

ButI think that the above source code is strange a bit. Is there any particular style that you, experienced programmers use ?

**BlackSlash12** · 09-04-2007

In the meantime I thought this:

Code:

#include <iostream>

using namespace std;

enum CHOICE  {
     Wake = 1,
     Bath,
     Toilet,
     Hack,
     Quit   };

// Function Definition and Prototype

void ShowMenu()
{
    
    cout << endl << endl;
    cout << " ***** Menu ***** " <<endl;
    cout << "(1) Wake me up when project ends" << endl;
    cout << "(2) GOTO Bathroom" << endl;
    cout << "(3) fflussh(toilet)" << endl;
    cout << "(4) Hack the kernel" << endl;
    cout << "(5) Quit" << endl;
}

void InputCheck(int choice)
{
     while ( choice < Wake || choice > Quit )
     {
           cout << "/nWrong! Retry ..." << endl;
           cout << "Select you choice (in number) :";
       cin >> choice;
     }
}

int main()
{
    int choice;
    bool fQuit = false;
    
          ShowMenu();
           cout << "Select you choice (in number) :";
           cin >> choice;
          InputCheck(choice);
          
                    
          switch(choice)
          {
                        case Wake:
                             cout << "Drinsane!!! " << endl;
                             break;
                        case Bath:
                             cout << "Please wait while bathing ... " << endl;
                             cout << "You smell sehr gut" << endl;
                             break;
                        case Toilet:
                             break;
                        case Hack:
                             break;
                        case Quit:
                             fQuit = true;
                             cout << "\nExiting .... " << endl << endl;
                             break;
                        default:
                                fQuit = true;
                                cout << "\nExiting .... " << endl << endl;
                                break;
          }
    system("PAUSE");
    return 0;
}

**BlackSlash12** · 09-04-2007

Well I think that is best:

Code:

#include <iostream>

using namespace std;

enum CHOICE  {
     Wake = 1,
     Bath,
     Toilet,
     Hack,
     Quit   };

// Function Definition and Prototype

int DoMenu()
{
    int choice;
    
    cout << endl << endl;
    cout << " ***** Menu ***** " <<endl;
    cout << "(1) Wake me up when project ends" << endl;
    cout << "(2) GOTO Bathroom" << endl;
    cout << "(3) fflussh(toilet)" << endl;
    cout << "(4) Hack the kernel" << endl;
    cout << "(5) Quit" << endl;
    
    cin >> choice;
    return choice;
}

int main()
{
    int choice;
    bool fQuit = false;
    
    while (!fQuit)
    {
          char  reSelect;
          choice = DoMenu();
      
          switch(choice)
          {
                        case Wake:
                             cout << "Drinsane!!! " << endl;
                             break;
                        case Bath:
                             cout << "Please wait while bathing ... " << endl;
                             cout << "You smell sehr gut" << endl;
                             break;
                        case Toilet:
                             break;
                        case Hack:
                             break;
                        case Quit:
                             fQuit = true;
                             cout << "\nExiting .... " << endl << endl;
                             break;
                        default:
                                fQuit = true;
                                cout << "\nExiting .... " << endl << endl;
                                break;
          }
          
          if (fQuit == false)
          {
                    cout << "\n\t\tDo you want to select again ? (Y/N):";
                    cin >> reSelect;
          
                    if ( reSelect = 'Y' )
                    {
                        continue;
                    }
          }
}        
          
    system("PAUSE");
    return 0;
}

**matsp** · 09-04-2007

Comments in the code in red!

Originally Posted by BlackSlash12

Code:

...
                        case Quit:
                             fQuit = true;
                             cout << "\nExiting .... " << endl << endl;
                             break;
                        default:
So, if the poor user presses any other number, it automatically quits the application
                                fQuit = true;
                                cout << "\nExiting .... " << endl << endl;
                                break;
          }
          
          if (fQuit == false)
          {
                    cout << "\n\t\tDo you want to select again ? (Y/N):";
                    cin >> reSelect;
        
  
                    if ( reSelect = 'Y' )  // Assigning reSelect with 'Y' will always be true, as 'Y' is not 0!
                    {
What's te purpose of this bit then? Do you actually understand what this does?
                        continue;
                    }
Assuming the user pressed "N", what is supposed to happen? [And assuming your assignment is changed to a test for equality]
          }
}        
          
    system("PAUSE");
    return 0;
}

--
Mats

**BlackSlash12** · 09-04-2007

So...what to do ? Could you fix it or post your code-design style ?

**matsp** · 09-04-2007

Originally Posted by BlackSlash12

So...what to do ? Could you fix it or post your code-design style ?

Well, if you want the user to quit due to selecting an invalid choice, that's your choice - but I prefer applications that let me be a bit clumsy - do you ever hit the wrong key?

As to your use of assignment instead of test for equality, I would prefer this:

Code:

                    if ( 'Y' == reSelect )
                    {
                        continue;
                    }

But of course, there's no reason to do any of it, because it makes no difference - continue is only useful in a loop if there's something else to do after the continue statement. In this case, there's just closing braces between this point and the end of the while-loop, so the whole if-statement is pointless.

Of course, the other unanswered question is what you want to do if N is pressed - is that supposed to do something, or is Y and N equivalent - if so, why do you ask the user to enter Y or N? [And of course, what happens if it's neither?]

--
Mats

**BlackSlash12** · 09-04-2007

I want to display the menu choices and then let the user to select one. That's ok.

Afterwards I wan to create a input check.

Code:

while (choice > 5 || choice <0)
{
      cout << "You wrong";
      cout << "Retype: ";
      cin >> choice;
}

Is this code block, ok ?

**matsp** · 09-04-2007

Originally Posted by BlackSlash12

I want to display the menu choices and then let the user to select one. That's ok.

Afterwards I wan to create a input check.

Code:

while (choice > 5 || choice <0)
{
      cout << "You wrong";
      cout << "Retype: ";
      cin >> choice;
}

Is this code block, ok ?

Yes, except you may want to use the enums instead of numbers - otherwise, what's the point of using enums in the first place?

edit: And by the way, the code you show here will allow zero as a valid choice, which isn't valid. Another reason to use the enum.

--
Mats

**BlackSlash12** · 09-04-2007

You right!Fixed but what about the loop ? I want the opportunity to reselect again (if pressed y) or exit (if pressed n).

Code:

#include <iostream>

using namespace std;

enum CHOICE  {
     Wake = 1,
     Bath,
     Toilet,
     Hack,
     Quit   };

// Function Definition and Prototype

int DoMenu()
{
    int choice;
    
    cout << endl << endl;
    cout << " ***** Menu ***** " <<endl;
    cout << "(1) Wake me up when project ends" << endl;
    cout << "(2) GOTO Bathroom" << endl;
    cout << "(3) fflussh(toilet)" << endl;
    cout << "(4) Hack the kernel" << endl;
    cout << "(5) Quit" << endl;
    
    cin >> choice;
    while (choice > Quit || choice < Wake)
{
      cout << "You wrong! ";
      cout << "Retype: ";
      cin >> choice;
}
    return choice;
}

int main()
{
    int choice;
    bool fQuit = false;
    
    while (!fQuit)
    {
          char  reSelect;
          choice = DoMenu();
      
          switch(choice)
          {
                        case Wake:
                             cout << "Drinsane!!! " << endl;
                             break;
                        case Bath:
                             cout << "Please wait while bathing ... " << endl;
                             cout << "You smell sehr gut" << endl;
                             break;
                        case Toilet:
                             break;
                        case Hack:
                             break;
                        case Quit:
                             fQuit = true;
                             cout << "\nExiting .... " << endl << endl;
                             break;
                        default:
                                fQuit = true;
                                cout << "\nExiting .... " << endl << endl;
                                break;
          }
          
          cout << "Do you want to select another one ?  (y/n) :";
          cin >> reSelect;
        
        /// What now ???               
          
          
}        
          
    system("PAUSE");
    return 0;
}

**matsp** · 09-04-2007

What do you think it should do to reselect?

I don't really understand why you want to have a yes-no question there, rather than just go back to the menu - there is a menu choice to exit, right? So why have another question that asks if you want to exit or continue?

--
Mats

**BlackSlash12** · 09-04-2007

For example if I select 3 a particular message is printed. How can I come back to the menu ? I do not know .... so I invested y/n.

**BlackSlash12** · 09-04-2007

I think I made it!

Code:

#include <iostream>

using namespace std;

enum CHOICE  {
     Wake = 1,
     Bath,
     Toilet,
     Hack,
     Quit   };

// Function Definition and Prototype

int DoMenu()
{
    int choice;
    
    cout << endl << endl;
    cout << " ***** Menu ***** " <<endl;
    cout << "(1) Wake me up when project ends" << endl;
    cout << "(2) GOTO Bathroom" << endl;
    cout << "(3) fflussh(toilet)" << endl;
    cout << "(4) Hack the kernel" << endl;
    cout << "(5) Quit" << endl;
    
    cout << "Please select :";
    cin >> choice;
    while (choice > Quit || choice < Wake)
{
      cout << "You wrong! ";
      cout << "Retype: ";
      cin >> choice;
}
    return choice;
}

int main()
{
    int choice;
    bool fQuit = false;
    
    while (!fQuit)
    {
          char  reSelect;
          choice = DoMenu();
      
          switch(choice)
          {
                        case Wake:
                             cout << "Drinsane!!! " << endl;
                             break;
                        case Bath:
                             cout << "Please wait while bathing ... " << endl;
                             cout << "You smell sehr gut" << endl;
                             break;
                        case Toilet:
                             break;
                        case Hack:
                             break;
                        case Quit:
                             fQuit = true;
                             cout << "\nExiting .... " << endl << endl;
                             break;
                        default:
                                 fQuit = true;
                             cout << "\nExiting .... " << endl << endl;
                             break;
          }
          
          if (choice != Quit )
          {
                     cout << "Do you want to select another one ?  (y/n) :";
                     cin >> reSelect;
                     while (reSelect != 'y' && reSelect != 'n')
                     {
                           cout << "You wrong! Type 'y' or 'n' :";
                           cin >> reSelect;
                     }
                     if (reSelect == 'n')
                     {
                                cout << "\nExiting .... " << endl << endl;  
                                break;
                     }
          }
                           
        
        /// What now ???               
          
          
}        
          
    system("PAUSE");
    return 0;
}

Right isn't it ? If you wish you could post your way (without y/n).

**BlackSlash12** · 09-04-2007

Sorry for double post, I just found what you mean.

Code:

#include <iostream>

using namespace std;

enum CHOICE  {
     Wake = 1,
     Bath,
     Toilet,
     Hack,
     Quit   };

// Function Definition and Prototype

int DoMenu()
{
    int choice;
    
    cout << endl << endl;
    cout << " ***** Menu ***** " <<endl;
    cout << "(1) Wake me up when project ends" << endl;
    cout << "(2) GOTO Bathroom" << endl;
    cout << "(3) fflussh(toilet)" << endl;
    cout << "(4) Hack the kernel" << endl;
    cout << "(5) Quit" << endl;
    
    cout << "Please select :";
    cin >> choice;
    while (choice > Quit || choice < Wake)
{
      cout << "You wrong! ";
      cout << "Retype: ";
      cin >> choice;
}
    return choice;
}

int main()
{
    int choice;
    bool fQuit = false;
    
    while (!fQuit)
    {
          char  reSelect;
          choice = DoMenu();
      
          switch(choice)
          {
                        case Wake:
                             cout << "Drinsane!!! " << endl;
                             break;
                        case Bath:
                             cout << "Please wait while bathing ... " << endl;
                             cout << "You smell sehr gut" << endl;
                             break;
                        case Toilet:
                             break;
                        case Hack:
                             break;
                        case Quit:
                             fQuit = true;
                             cout << "\nExiting .... " << endl << endl;
                             break;
                        default:
                                 fQuit = true;
                             cout << "\nExiting .... " << endl << endl;
                             break;
          }
          
          if (choice != Quit )
          {
                     continue;
          }
                           
        
        /// What now ???               
          
          
}        
          
    system("PAUSE");
    return 0;
}

Is this ?

**matsp** · 09-04-2007

I still don't understand the reason for your "if (choice != Quit) continue;" - it's not needed, the while-loop will continue anyways, until your end-condtion (fQuit) becomes true.

--
Mats

**BlackSlash12** · 09-04-2007

You right! Do you prefer using enum or not ?

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