How can I clear console

Question

As in the title  How can I clear console in C

User · Answer

For pure C    You can t   C   doesn t even have the concept of a console   The program could be printing to a printer  outputting straight to a file  or being redirected to the input of another program for all it cares   Even if you could clear the console in C    it would make those cases significantly messier   See this entry in the comp lang c   FAQ    http   www parashift com c  -faq-lite input-output html faq-15 20   OS-Specific  If it still makes sense to clear the console in your program  and you are interested in operating system specific solutions  those do exist   For Windows  as in your tag   check out this link    How do we clear the console in assembly    Edit  This answer previously mentioned using system  cls     because Microsoft said to do that  However it has been pointed out in the comments that this is not a safe thing to do  I have removed the link to the Microsoft article because of this problem   Libraries  somewhat portable   ncurses is a library that supports console manipulation    http   www gnu org software ncurses   runs on Posix systems  http   gnuwin32 sourceforge net packages ncurses htm  somewhat old Windows port

User · Answer

use  clrscr      include  lt iostream gt  using namespace std  int main                               clrscr             cout  lt  lt   Hello World    lt  lt  endl           return 0

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If you re on Windows  HANDLE h  CHAR INFO v3  COORD v4  SMALL RECT v5  CONSOLE SCREEN BUFFER INFO v6  if   h    HANDLE GetStdHandle 0xFFFFFFF5    unsigned int GetConsoleScreenBufferInfo h   amp v6          v5 Right   v6 dwSize X      v5 Bottom   v6 dwSize Y      v3 Char UnicodeChar   32      v4 Y   -v6 dwSize Y      v3 Attributes   v6 wAttributes      v4 X   0        DWORD    amp v5 Left   0      ScrollConsoleScreenBufferW h   amp v5  0  v4   amp v3       v6 dwCursorPosition     0        HANDLE v1   GetStdHandle 0xFFFFFFF5       SetConsoleCursorPosition v1  v6 dwCursorPosition      This is what the system  quot cls quot    does without having to create a process to do it

User · Answer

Use System  Console  Clear     This will clear  empty  the buffer

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define  WIN32 WINNT 0x0500        windows  gt   2000   include  lt windows h gt    include  lt iostream gt   using namespace std    void pos short C  short R        COORD xy       xy X   C       xy Y   R       SetConsoleCursorPosition       GetStdHandle STD OUTPUT HANDLE   xy     void cls          pos 0 0       for int j 0 j lt 100 j        cout  lt  lt  string 100            pos 0 0       int main  void            write somthing and wait      for int j 0 j lt 100 j        cout  lt  lt  string 10   a        cout  lt  lt    n npress any key to cls           cin get            clean the screen     cls         return 0

User · Answer

edit  completely redone question  Simply test what system they are on and send a system command depending on the system  though this will be set at compile time   ifdef   WIN32     system  cls     else     system  clear       most other systems use this  endif   This is a completely new method

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include  lt cstdlib gt   void cls     if defined  WIN32    if windows     system  cls      else     system  clear         if other  endif    finish       The just call cls   anywhere

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For Linux Unix and maybe some others but not for Windows before 10 TH2   printf   033c      will reset terminal

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In Windows    include  lt cstdlib gt   int main          std  system  cls        return 0      In Linux Unix    include  lt cstdlib gt   int main          std  system  clear        return 0

User · Answer

Here is a simple way to do it    include  lt iostream gt   using namespace std   int main         cout flush       Flush the output stream     system  clear       Clear the console with the  system  function

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outputting multiple lines to window console is useless  it just adds empty lines to it  sadly  way is windows specific and involves either conio h  and clrscr   may not exist  that s not a standard header either  or  Win API method   include  lt windows h gt   void ClearScreen         HANDLE                     hStdOut    CONSOLE SCREEN BUFFER INFO csbi    DWORD                      count    DWORD                      cellCount    COORD                      homeCoords     0  0       hStdOut   GetStdHandle  STD OUTPUT HANDLE      if  hStdOut    INVALID HANDLE VALUE  return        Get the number of cells in the current buffer      if   GetConsoleScreenBufferInfo  hStdOut   amp csbi    return    cellCount   csbi dwSize X  csbi dwSize Y        Fill the entire buffer with spaces      if   FillConsoleOutputCharacter      hStdOut       TCHAR           cellCount      homeCoords       amp count        return        Fill the entire buffer with the current colors and attributes      if   FillConsoleOutputAttribute      hStdOut      csbi wAttributes      cellCount      homeCoords       amp count        return        Move the cursor home      SetConsoleCursorPosition  hStdOut  homeCoords          For POSIX system it s way simpler  you may use ncurses or terminal  functions   include  lt unistd h gt   include  lt term h gt   void ClearScreen         if   cur term            int result      setupterm  NULL  STDOUT FILENO   amp result        if  result  lt   0  return           putp  tigetstr   clear

User · Answer

For Windows  via Console API   void clear         COORD topLeft      0  0        HANDLE console   GetStdHandle STD OUTPUT HANDLE       CONSOLE SCREEN BUFFER INFO screen      DWORD written       GetConsoleScreenBufferInfo console   amp screen       FillConsoleOutputCharacterA          console       screen dwSize X   screen dwSize Y  topLeft   amp written            FillConsoleOutputAttribute          console  FOREGROUND GREEN   FOREGROUND RED   FOREGROUND BLUE          screen dwSize X   screen dwSize Y  topLeft   amp written            SetConsoleCursorPosition console  topLeft       It happily ignores all possible errors  but hey  it s console clearing  Not like system  cls   handles errors any better   For  nixes  you usually can go with ANSI escape codes  so it d be   void clear            CSI 2J clears screen  CSI H moves the cursor to top-left corner     std  cout  lt  lt    x1B 2J x1B H       Using system for this is just ugly

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This is hard for to do on MAC seeing as it doesn t have access to the windows functions that can help clear the screen  My best fix is to loop and add lines until the terminal is clear and then run the program  However this isn t as efficient or memory friendly if you use this primarily and often   void clearScreen        int clear   5      do           cout  lt  lt  endl          clear -  1        while  clear   0

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To clear the screen you will first need to include a module    include  lt stdlib h gt    this will import windows commands  Then you can use the  system  function to run Batch commands  which edit the console   On Windows in C    the command to clear the screen would be   system  CLS      And that would clear the console  The entire code would look like this    include  lt iostream gt   include  lt stdlib h gt   using namespace std   int main     system  CLS        And that s all you need  Goodluck

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Use system  cls   to clear the screen    include  lt stdlib h gt   int main void        system  cls        return 0

User · Answer

The easiest way for me without having to reinvent the wheel  void Clear      if defined  WIN32     system  quot cls quot          clrscr       including header file   conio h  elif defined    LINUX       defined   gnu linux       defined   linux        system  quot clear quot          std  cout lt  lt  u8 quot  033 2J 033 1 1H quot     Using ANSI Escape Sequences   elif defined    APPLE        system  quot clear quot     endif     On Windows you can use  quot conio h quot  header and call clrscr function to avoid the use of system funtion    include  lt conio h gt  clrscr      On Linux you can use ANSI Escape sequences to avoid use of system function  Check this reference ANSI Escape Sequences      std  cout lt  lt  u8 quot  033 2J 033 1 1H quot      On MacOS Investigating

User · Answer

You can use the operating system s clear console method via system      for windows it would be system  cls    for example and instead of releasing three different codes for different operating systems  just make a method to get what os is running  you can do this by detecting if unique system variables exist with  ifdef e g   enum OPERATINGSYSTEM    windows   0  mac   1  linux   2   etc you get the point      void getOs         ifdef  WIN32         return OPERATINGSYSTEM windows      elif   APPLE     etc you get the point       endif    int main        int id   getOs        if id    OPERATINGSYSTEM windows           system  CLS         else if  id    OPERATINGSYSTEM mac           system  CLEAR            etc you get the point

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The easiest way would be to flush the stream multiple times   ideally larger then any possible console   1024 1024 is likely a size no console window could ever be   int main int argc  char  argv      for int i   0  i  lt 1024 1024  i          std  cout  lt  lt       lt  lt  std  endl     return 0      The only problem with this is the software cursor  that blinking thing   or non blinking thing   depending on platform   console will be at the end of the console  opposed to the top of it  However this should never induce any trouble hopefully

User · Answer

In Windows we have multiple options      clrscr    Header File   conio h  system  cls    Header File   stdlib h    In Linux  use system  clear    Header File   stdlib h

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