how reset the program

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C++

Hi.
I want reset my program. for example if I press key R my program start from begin
how can I do that ?

Posted 23-Dec-12 2:29am

mohammadali1375

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2 solutions

Solution 2

You need to add a method to your main class that purges all views and documents and resets all control variables to their initial state. However, only you know what those things are.

Posted 23-Dec-12 5:44am

Richard MacCutchan

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Thomas Daniels · Accepted Answer · 2012-12-23T02:44:00

Solution 1

Hi,

For a console application:
At the top of your code file, add this:

C++

#include <conio.h>

In your main method:

C++

bool stop = false;
while (!stop)
{
      system("cls"); // clear console
      // run your program
      int pressedChar = getch();
      stop = pressedChar != 114; // 114 = 'R'
}
return 0;

For a Windows application:
Have a look here:
http://www.cplusplus.com/forum/windows/42674/[^]
How To Create a Self-Restartable Application[^]

Hope this helps.

Posted 23-Dec-12 2:44am

Thomas Daniels

Updated 23-Dec-12 3:25am

v3

Comments

Abhishek Pant 23-Dec-12 8:45am

+5

Thomas Daniels 23-Dec-12 8:46am

Thank you!

mohammadali1375 23-Dec-12 9:20am

thanks. but my program is'n a console program. its a 2d game with sdl and have alot of class and vars. i want after the game end , my program re start for play again.

Thomas Daniels 23-Dec-12 9:21am

Thanks for your reply!
I'll try to find how to restart a Windows application.

mohammadali1375 23-Dec-12 9:55am

Thanks for your help

Thomas Daniels 23-Dec-12 9:56am

You're welcome!

Richard MacCutchan 23-Dec-12 11:48am

Your expression is wrong (should be ==), and why not use the actual character constant rather than a decimal number, thus:
stop = pressedChar == 'r';

Thomas Daniels 24-Dec-12 5:36am

I agree that it's better if I use 'r' instead of 114, but I don't agree with the == operator. While stop is false, then your program must run. stop = pressedChar != 'r', so stop is true if the pressed char is 'r', and false if the pressed char isn't 'r'.

Richard MacCutchan 24-Dec-12 5:54am

No, in the above expression stop becomes true if the pressed character is not equal to 'r'. Try it for yourself.

Thomas Daniels 24-Dec-12 6:01am

No, stop = pressedChar != 'r', so stop becomes true if pressedChar != 'r'. And the application must stop if the pressed char isn't 'r'.

Richard MacCutchan 24-Dec-12 6:06am

1. That's what I said.
2. Read the question.

Thomas Daniels 24-Dec-12 6:10am

I did read the question. if I press key R my program start from begin, so if the pressed char isn't 'r', then the application doesn't start from begin, but then the application terminates, and if the pressed char is 'r', then the application starts at the begin of the while loop.

Richard MacCutchan 24-Dec-12 6:26am

So with your code if the user presses any key the program terminates. I don't think that is what the OP asked for. What he wants is for the program to run and if 'r' is pressed then it should restart from the beginning.

Thomas Daniels 24-Dec-12 6:30am

Yes. If you press the 'r' key, the program starts from the beginning. But if another key is pressed, then the program ends, because my program asks for input at the end of the while loop. If 'r' is pressed, then you start again at the begin of my while loop.