My program exits on me right away!

This is a discussion on My program exits on me right away! within the C++ Programming forums, part of the General Programming Boards category; Hi, I just started programming three days ago and I am having a little problem. When I run a program ...

  1. #1
    n00b programmer
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    Oct 2005
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    15

    My program exits on me right away!

    Hi,
    I just started programming three days ago and I am having a little problem. When I run a program I have made that doesnt require any input (like Hello World!), the DOS window will open and close with a second. I have found the only way to prevent this is to use this bit of code...
    Code:
     
    #include <iostream>
    
    unsigned short t;
    
    int main ()
    {
        std::cout<<"Press any key followed by enter to exit\n";
        std::cin >> t;
        
        return 0;
    }
    Help?

  2. #2
    1479
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    Aug 2003
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    Code:
     
    #include <iostream>
    
    unsigned short t;
    
    int main ()
    {
        std::cout<<"Press any key followed by enter to exit\n";
        std::cin >> t;
       
        system("PAUSE");
     
        return 0;
    }
    Help?
    not the best way but it works
    Knowledge is power and I want it all

    -0RealityFusion0-

  3. #3
    n00b programmer
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    Oct 2005
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    What do you mean not the best? It works great! Plus it displays that cool "Press any key to continue..." line of text! Thank you!

  4. #4
    1479
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    I think it is system and compiler specific function....not to sure.

    A more common way would be to use cin.get() instead.
    Knowledge is power and I want it all

    -0RealityFusion0-

  5. #5
    Bond sunnypalsingh's Avatar
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    system command is not a portable code...go for this
    Code:
    #include <iostream>
    #include <limits>
    
    using namespace std;
    
    int main()
    {
      // Your code here
    
      // Clean up the stream and ask for input
      cin.ignore ( numeric_limits<streamsize>::max(), '\n' );
      cin.get();
    }

  6. #6
    Registered User
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    lol using system("PAUSE") would br much shorter

  7. #7
    Cat Lover
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    Sydney, Australia
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    But system("pause") would only work on a limited range of computers. Try using it on a mac and it won't work.

    The other version will work on any platform.

  8. #8
    n00b programmer
    Join Date
    Oct 2005
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    15
    Quote Originally Posted by sunnypalsingh
    system command is not a portable code...go for this
    Code:
    #include <iostream>
    #include <limits>
    
    using namespace std;
    
    int main()
    {
      // Your code here
    
      // Clean up the stream and ask for input
      cin.ignore ( numeric_limits<streamsize>::max(), '\n' );
      cin.get();
    }
    Lol, I understand about 25% of that code. Just started programming four days ago... Thanks for the help!
    Home is where the computer is
    I like the smell of the treats!
    Mmmm, Root Beer...

  9. #9
    dra
    dra is offline
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    Quote Originally Posted by aznboi
    lol using system("PAUSE") would br much shorter
    never use the system function. It invokes another program do the "pausing" for you. It's not standard C++ so it's makes your code less portable.

  10. #10
    Super Moderator
    Join Date
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    4,913
    never use the system function.
    I wouldn't say that - but in this specific case it is a bad idea - for more details and a correct explanation you can refer to the programming tips section of the website.

  11. #11
    Bond sunnypalsingh's Avatar
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    Use this then....if you couldn't understood previous solution but don't use system
    Code:
    #include <stdio.h>
    
    intmain(int argc, char **argv)
    {
      printf ("Press ENTER to continue.\n");
      getchar (); /* wait for input */
      return 0;
    }

  12. #12
    Banned nickname_changed's Avatar
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    Man you guys are fussy fuss pots. If his application is only for Windows, and it only prints Hello World, then surely the system() function is OK? I mean, sure, he COULD port 'Hello World' to Linux, but I don't think theres a lot of reason to do so.

    I'm sure it's a better practice to stay platform independant and stick to the standard library as much as possible, but theres time to learn that later - I think for now system("pause") is fine.

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