Clear Console in C 1

[OOzy]

Hello

How can I clear the console in C?

OOzy

 

[rbobbitt]

C doesn't provide a mechanism for this, you'll have to rely on implementation-specific extensions. In DOS, it's typically:

#include <conio.h>

/* ... */

clrscr();

The only portable C way to do this is to write a series of newlines to the display:

int height=80;
int i;

for (i=0;i<height;++i) {
putchar('\n');
}

Russ
bobbitts@hotmail.com

http://home.earthlink.net/~bobbitts

 

[SwapSawe]

What robbitt has said bout the alternate way is really a good logic however the height need not to be 80 rather u can just define it to be 24 as the console has only 25 rows.

SwapSawe.

 

[rbobbitt]

Not every console. I just picked 80 as an arbitrary value. Of course, determining the console height is not anything you can do portably, so you may as well go with a function like clrscr() or write so many newlines that it will be sure to clear *any* console.

Russ
bobbitts@hotmail.com

http://home.earthlink.net/~bobbitts

 

[aphrodita]

One could use :

...
system(&quot;cls&quot;
...

function that can be found in the stdlib.h file Best Regards,

aphrodita@mail.krovatka.ru {uiuc rules}

http://www.hellforge.org

 

[ManasBehera]

Agreed with rbobbitt and swapsawe and there is also an alternative way

just include this line along with the #include statements

#define &quot;\x1B[2J&quot; CLEAR

and call CLEAR; from inside the program It will clear the screen.

 

[rbobbitt]

I think you mean:

#define CLEAR &quot;\x1B[2J&quot;

I'm curious, in what compiler/environment does this work?



Russ
bobbitts@hotmail.com

http://home.earthlink.net/~bobbitts

 

[ManasBehera]

I think you mean:

#define CLEAR &quot;\x1B[2J&quot;

I'm curious, in what compiler/environment does this work?

Yes rbobbitt that's right .it works in turbo C++ compiler.
I have not tested it with any other compiler.

Manas

 

[obscurifer]

Regarding aphrodita's comment, the call to system() will work, with the proviso that you need to provide an argument that is the command-line command to clear the screen in your particular OS. DOS/Windows uses &quot;cls&quot;, but many Unices use &quot;clear&quot;.

If you want portability, you might find it easiest to use the quick-n-dirty method of printing some arbitrary number of newlines.

Share and Enjoy!

 

[aphrodita]

As far as I know, &quot;clear&quot; is used on Unix Best Regards,

aphrodita@mail.krovatka.ru {uiuc rules}

http://www.hellforge.org

 

[abp]

On UNIX consoles or xterms, printing the following string of chars does the trick. But this code doesnt work on Windows.


Regards,

abp
#include <stdio.h>

main()
{

char str[] =
{0x1b, 0x5b, 0x48, 0x1b, 0x5b, 0x4a, '\0'};

printf(&quot;%s&quot;, str);

}

 

[abp]

For Win32 try this. I am not sure how it ports
to Win 16-bit platform.

Best Regards,

abp

#include <windows.h>
#include <conio.h>
#define SPACE ' '

int clear_console();

main()
{
clear_console();
return;
}

int clear_console()
{

// Get the handle to Standard Output (STDOUT)

HANDLE hndlStdOut = GetStdHandle(STD_OUTPUT_HANDLE);
CONSOLE_SCREEN_BUFFER_INFO csBi;

// Fill console screen buffer
GetConsoleScreenBufferInfo(hndlStdOut, &csBi);
DWORD written;
DWORD SZ;

SZ = csBi.dwSize.X * csBi.dwCursorPosition.Y;
// csBi.dwCursorPosition.X + 1;
COORD curhome = {0, 0};

FillConsoleOutputCharacter(hndlStdOut, SPACE, SZ, curhome, &written);

csBi.srWindow.Bottom -= csBi.srWindow.Top;
csBi.srWindow.Top = 0;

SetConsoleWindowInfo(hndlStdOut, TRUE, &csBi.srWindow);
SetConsoleCursorPosition(hndlStdOut, curhome);

return 0;
}