How do I clear screen in a C program?

This is a discussion on How do I clear screen in a C program? within the C Programming forums, part of the General Programming Boards category; Hi. Kinda new to C. After I ask a user > printf("Please type your first name"); scanf("%s", &name); /* I ...

  1. #1
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    How do I clear screen in a C program?

    Hi. Kinda new to C. After I ask a user >

    printf("Please type your first name");
    scanf("%s", &name);

    /* I now want to clear screen

    puts("Now enter your age");
    scanf("%d", &age);

    I use Linux and was trying to use this>
    system(clear)

    I inluded <stdlib.h>
    at beginning of my simple program but the program failed.

    How should I clear the screen by calling 'clear'

    thanks

  2. #2
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    http://www.cprogramming.com/boardfaq.html#clear

    Read away my friend, read away.
    "...the results are undefined, and we all know what "undefined" means: it means it works during development, it works during testing, and it blows up in your most important customers' faces." --Scott Meyers

  3. #3
    Im back! shaik786's Avatar
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    >system(clear)
    If clear is not a declared variable holding the shell command to clear the screen, then it's wrong. You need to do:
    Code:
    system("clear");  /*   UNIX   */
    system("cls");    /*   DOS   */

  4. #4
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    If you wish to use clearscreen in testmode..
    I can use clrscr();
    Remember to include ...
    #include <conio.h>
    Conio is not ANSI C, but Borland Extension I think!!!

    Then you can write
    clrscr();
    to clear screen....

    But since you use Linux this info. is no use for you :-)
    Didn't see that at first.

    But if others is using Borland this can do it..
    Last edited by Gugge; 08-21-2002 at 10:53 AM.
    !G!

  5. #5
    Code Goddess Prelude's Avatar
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    >How should I clear the screen by calling 'clear'
    system takes a string as the argument, so your command should be:

    system ( "clear" );

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

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    so I have to #include <stdlib.h>
    and then whereever I want to clear the screen I simply throw in system("clear"); ??

    Remember I am programming in Linux so I don't use bordland.




    thanks dudes!

  7. #7
    Code Goddess Prelude's Avatar
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    >so I have to #include <stdlib.h>
    >and then whereever I want to clear the screen I simply throw in system("clear"); ??
    Correct, but use it sparingly. The system function is frighteningly slow and many calls to it will seriously effect your program's running time. You would also do well to think ahead and create a macro to make porting to a different system easier:
    Code:
    #if defined POSIX
      #define CLEARSCR system ( "clear" )
    #elif defined MSDOS || defined WIN32
      #define CLEARSCR system ( "cls" )
    #endif
    -Prelude
    My best code is written with the delete key.

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