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Clear screen function

Aaveg (1)
What should be used in c++ for clrscr()? as we us in c
When I put clrscr(); after variable declaration in program it is showing error
and error is that function should have a prototype.
Yes I ask for dos based console only
Thank u every body for information and I am a beginner in C and have started in dos based console borland turbo C
I think beginner forum is good for me and I asked this question bcoz it was showing output after the 1st program's o/p on same screen?
Last edited on
Yay295 (431)
There isn't one. Why do you need to clear the console?
keskiverto (10402)
There isn't one, because the question is: Which console?

There is no the console. There is no standard. There are multiple, different terminal types, which each accept different control events. The clsscr() was for a DOS-based console.

Look up ncurses. It is a more recent library that implements some "text UI". There is some variant *curses for Windows too.
Last edited on
Idontownaplanet (18)
There is no standard. For Windows you can use;
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#include <windows.h>

void clear_screen()
{
  DWORD n;                         /* Number of characters written */
  DWORD size;                      /* Number of visible characters */
  COORD coord = {0};               /* Top left screen position */
  CONSOLE_SCREEN_BUFFER_INFO csbi;

  /* Get a handle to the console */
  HANDLE h = GetStdHandle ( STD_OUTPUT_HANDLE );

  GetConsoleScreenBufferInfo ( h, &csbi );

  /* Find the number of characters to overwrite */
  size = csbi.dwSize.X * csbi.dwSize.Y;

  /* Overwrite the screen buffer with whitespace */
  FillConsoleOutputCharacter ( h, TEXT ( ' ' ), size, coord, &n );
  GetConsoleScreenBufferInfo ( h, &csbi );
  FillConsoleOutputAttribute ( h, csbi.wAttributes, size, coord, &n );

  /* Reset the cursor to the top left position */
  SetConsoleCursorPosition ( h, coord );
}
Duthomhas (13206)
Little Bobby Tables (1079)
heres something i wrote based off duoas's post (well more like threw together. i didnt actually write it)

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#ifdef _WIN32
    #include <windows.h>

#else
    #include <unistd.h>
    #include<term.h>
#endif

    void clear() {
    #ifdef _WIN32
        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 || !GetConsoleScreenBufferInfo( hStdOut, &csbi )) return;

        cellCount = csbi.dwSize.X *csbi.dwSize.Y;

        if(!FillConsoleOutputCharacter(hStdOut, (TCHAR) ' ', cellCount, homeCoords, &count)) return;
        if(!FillConsoleOutputAttribute(hStdOut, csbi.wAttributes, cellCount, homeCoords, &count)) return;

        SetConsoleCursorPosition( hStdOut, homeCoords );

    #else
        if(!cur_term) {
            int result;
            setupterm( NULL, STDOUT_FILENO, &result );
            if(result <= 0) return;
        }

        putp(tigetstr("clear"));
    #endif
    }

Why do you need to clear the console?

there are many reasons why... console programs arent irelevant
Last edited on
Yay295 (431)
You aren't required to clear the screen if you make a console program.
Little Bobby Tables (1079)
i am aware. that doesnt mean you dont need to. im also not required to clear my gui irc screen. but i do anyways. im not required to clear my browsing history. but i do anyways
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