clear screen function probs

This is a discussion on clear screen function probs within the C Programming forums, part of the General Programming Boards category; I know there is a section about this in the faq but i'm still having problems. I need a clear ...

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    clear screen function probs

    I know there is a section about this in the faq but i'm still having problems. I need a clear screen function in c. The ones i have tried are either not ansi c compatible or like the one which uses the windows.h include crashes the program when it tries to load. So i'm at a loss. Any ideas? i don't want to use the new line method as its for a uni project and it isn't really a way that is going to get me a decent grade. so cheers for any help

  2. #2
    Code Goddess Prelude's Avatar
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    There's really no good way to clear the screen. If you don't have a gotoxy type function then you will just have to fill the screen with whitespace and work from there or backspace a LOT. If you do have something with gotoxy functionality then try setting the cursor to 0,0 and filling the screen with whitespace, then reset the cursor to 0,0. The screen is cleared.

    -Prelude
    My best code is written with the delete key.

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    Talking


    try this one out,

    char far *ptr=(char far *)0xb0008000;

    main(){

    int i,j;
    for(i=0;i<(80*25/2);i++){
    ++*ptr=' ';
    ptr='0';
    }
    }
    //this will work out you just see whether '0' belongs to black colour or not ,if it is giving different colour replace it with different letter which represents black color

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    i'll give that one a go - cheers. - how i miss c++ and the lovely clrscr() - oh well - i'm doing that next semester

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    you dont say what compiler you are using and operating system
    hoping to be certified (programming in c)
    here's the news - I'm officially certified.

  6. #6
    It's full of stars adrianxw's Avatar
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    >>> how i miss c++ and the lovely clrscr()

    clrscr() is not a standard function within C++. It is a non-standard function implemented by certain compiler vendors.
    Wave upon wave of demented avengers march cheerfully out of obscurity unto the dream.

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    here's one that works pretty nicely.


    system("cls"); use this if ur running under windows.
    system("clear"); or this if ur running under *nix.

    if u wanna get fancy u can probably write a bit of code that detects w/h OS u're running under and sets a char* to the correct value.

    but so far...this worked pretty nicely.

    system is a function in stdlib.h so u need to include that.
    curiousity killed the cat, but it
    makes for one hell of a programmer.

    Alien.

  8. #8
    Code Goddess Prelude's Avatar
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    >system("cls"); use this if ur running under windows.
    This is a brute force method which also happens to be incredibly inefficient. But if you must use it be sure to make it portable, for example:
    Code:
    /* pseudocode */
    #ifdef UNIX
      #define CLRSCR "clear"
    #ifdef WIN
      #define CLRSCR "cls"
    .
    .
    .
    system ( CLRSCR );
    -Prelude
    My best code is written with the delete key.

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    question to Prelude.

    hey,

    nice code...i just have one question.. is the variable UNIX and WIN defined no matter which compiler u use?

    that looks pretty slick if it is....

    also, would u need to use LINUX if u're running on a Linux box?
    curiousity killed the cat, but it
    makes for one hell of a programmer.

    Alien.

  10. #10
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    no, when you distribute the code, tell the user to add
    Code:
    #define WIN 1
    if they use windows, or:
    Code:
    #define UNIX 1
    if they use *nix.

  11. #11
    Code Goddess Prelude's Avatar
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    >is the variable UNIX and WIN defined no matter which compiler u use?
    They're environment variables that tell you what system you are on, I believe they are defined as _WIN32, _POSIX_, _MAC, and probably _LINUX though I'm not sure about the last two.

    Though there are a number of ways to go about that, mine was just some pseudocode to get the idea going. Try this and see what it prints. If you get an error on a Linux box then the variable isn't what I thought
    Code:
    #include <stdio.h>
    #include <stdlib.h>
    
    #ifdef _POSIX_ 
      #define PRINTF "POSIX"
    #elif _WIN32 
      #define PRINT "Windows"
    #elif _LINUX_
      #define PRINT "Linux"
    #elif _MAC
      #define PRINT "Mac"
    #endif
    
    int main ( void )
    {
      puts ( PRINT );
      return EXIT_SUCCESS;
    }
    -Prelude
    Last edited by Prelude; 03-07-2002 at 11:37 AM.
    My best code is written with the delete key.

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