Re: Dialog application opinion needed - C / C++ / MFC Discussion Boards

João Paulo Figueira4-May-03 6:54

4-May-03 6:54

In a mobile environment such as the PocketPC, it is the difference between a professional application (VC) and a pile of junk (VB). Worst, .NET here, means .NOT (too big, too slow)!

Menu driven console program --- professional suggestion needed.

Link26003-May-03 17:17

Link2600

3-May-03 17:17

//This is a console program using C++ language syntax.
//Please reply me in C++ language syntax only.
//Thank you very much.

I have written a GCD program and it is a menu driven program. Below
is a main menu. Instead of always looping back to main menu, I
have designed it so that I could always go back one step. For example,
when I press 1, the program will starts the GCD, after finishing it, I want
it to continue to run, not go back to main. If you copy the code and
run it for yourself, you will see what I mean.

My problem is, I have to put a lot of complicated control code in the
main() function, it is fine for this simple. But when I design a big
complicated program (I'm going to write a converter program), this
technique would not be good. So I wonder how a professional
programmer would design it.(remember: I don't want my program
always going back to main menu.)

main menu:
------------------------------------------------------
Welcome to the Greatest Common Divisor program.
To use the program, please enter one of the following
choices.
1. Start the Greatest Common Divisor (GDC)
2. Learn more about this program
3. Exit the program
>>
--------------------------------------------------------

press 1 and the program will start the GCD:
-------------------------------------------------------
Please enter the first number: 22
Please enter the second number: 44
The GCD is: 22.

Do you want to continue? [Y/N]
>>
---------------------------------------------------------

then if I press 1, the program will start it over again,
but not go back to menu.
----------------------------------------------------------
Please enter the first number:
----------------------------------------------------------

The code is below:
---------------------------------------------------------
#include <iostream>
#include <cstdlib>
#include <conio.h>
using namespace std;

int main_screen();
void GCDstart();
void aboutProgram();

int main()
{
int choice = 0;
while(choice != 3)
{
choice = main_screen();

//Choice 1 to start the GCD
if(choice == 1)
{

while(choice != 'N' && choice != 'n')
{
char choice = 'N';
GCDstart();
cout << "Do you want to continue? [Y/N]" << endl;
cout << ">> ";
cin >> choice;
if(choice == 'Y' || choice == 'y')
{
system("cls");
}
else if(choice == 'N' || choice == 'n')
{
cout << "Program will go back to main menu." << endl;
getch();
system("cls");
break;
}
else
{
cout <<"Input Error:" << endl;
break;
}
}
}

//Choice 2 to learn more about the program
else if(choice == 2)
{
aboutProgram();
}

//Choice 3 to break the loop
else if(choice == 3)
{
break;
}

//Display error
else
{
cout <<"Input Error: please try again!" << endl;
getch();
system("cls");
}

}

cout << "Bye!" << endl;

return 0;
}

int main_screen()
{
//Display choices of the main menu
cout << "Welcome to the Greatest Common Divisor program." << endl
<< "To use the program, please enter one of the following" << endl
<< "choices." << endl
<< "1. Start the Greatest Common Divisor (GDC)" << endl
<< "2. Learn more about this program" << endl
<< "3. Exit the program" <<endl;

get="" user's="" choice
="" int="" choice;
="" cout="" <<="" "="">> ";
cin >> choice;
return choice;
}

///////////////////////////////////////////
//GCD MAIN FUNCTION
void GCDstart()
{
system("cls");
int num_1, num_2;
int remainder = 1, GCD;

cout <<"Please enter the first number: ";
cin >> num_1;
cout <<"Please enter the second number: ";
cin >> num_2;

num_1 = abs(num_1);
num_2 = abs(num_2);

if (num_1 >= num_2)
{

while (remainder != 0)
{
remainder = num_1 % num_2;
num_1 = num_2;
num_2 = remainder;
GCD = num_1;
}
}
else if (num_2 >= num_1)
{
while (remainder != 0)
{
remainder = num_2 % num_1;
num_2 = num_1;
num_1 = remainder;
GCD = num_2;
}
}

cout << "The GCD is: " << GCD <<"." << endl << endl;

}

///////////////////////////////////////////////
//ABOUT PROGRAM FUNCTION

void aboutProgram()
{
system("cls");
cout << "This is a GCD program. It is a program that" << endl;
cout << "finds the Greatest Common Factors. Enter two" << endl;
cout << "integers and the program will tell you the GCD." << endl;
cout << "Please press any key to continue." << endl;
getch();
system("cls");
}

Re: Menu driven console program --- professional suggestion needed.

jhaga4-May-03 1:14

jhaga

4-May-03 1:14

Make each menu it's own function and call
them from a switch body. In this way you
only call the main_menu in main()
and in main_menu you call the next menus etc.

...
cin >> choice;
switch(choice )
{
case 1:
main_menu();
break;
case 2 :
other_menu(); //etc
break;
default :

break;
}

jhaga

Dialog application opinion needed

Steve Messer3-May-03 15:51

Steve Messer

3-May-03 15:51

I am trying to re-create the dialog functionality of a program called myHTPC ( www.myhtpc.net ).

I am new to gui programming so please bare with me. The above mentioned program is coded in Delphi 7 so I image that it uses forms. The functionality that I am trying to reproduce is the following:

The application consists of multiple dialogs ( very possibly many ):

Main Dialog: which can go to a music module and a slide show module. exiting the music or slide show module would bring you back to the main dialog. So with nested dialogs you can always go back to the previous dialog until you get back to the main dialog.

If you go to the music module and play a file then go back to the main dialog then select slide show the music should remain playing.

First off I am looking for theory not code so don't be alarmed. Each dialog would be full screen.

Questions:

1) Would you use a different dialog for each module or dynamically create each module when
selected.
2) Would you destroy each dialog as you create a new one or would you just display the new one
over the top of the previous one.
3) My final question ( for now ) is that of scope. How or where would you instaniate your objects
such that they won't be destroyed if I close the dialog that is controlling it.

Well I hope I explained myself well enough for someone to understand my question. Any advice or pointers would be appreciated.

Thanks,

Steve