clrscr( )用法

函数名: clrscr

功  能: 清除文本模式窗口，清屏的意思，即把之前显示出的文字字符去掉，是clear screen的简写

用  法: void clrscr(void);

程序例:

#include <conio.h>

int main  (void)

{

　　int i;

　　clrscr();

　　for (i = 0; i < 20; i++)

　　{

　　　　printf("%d\r\n", i);

　　}　　

　　cprintf("\r\nPress any key to clear screen");

　　getch();

　　clrscr();

　　printf("The screen has been cleared!");

　　getch();

　　return 0;

}

注意：

①只有在Turbo c 中可以运行 ！

②在Turbo C++ 中，需要先另存为（save as）.C格式，才能使用。

另解：

在VC中无法调用该函数，有下列办法：

1.  #include <windows.h>

system("cls");

这种办法的缺点是程序额外运行系统程序执行清屏操作，延长了程序执行时间。

 

2.自己写函数，这种办法比较快。

这是从微软MSDN得到的方法：

/* Standard error macro for reporting API errors */

#define PERR(bSuccess, api){if(!(bSuccess)) printf("%s:Error %d from %s \

on line %d\n", __FILE__, GetLastError(), api, __LINE__);}

void cls( HANDLE hConsole )

{

COORD coordScreen = { 0, 0 }; /* here's where we'll home the

cursor */

BOOL bSuccess;

DWORD cCharsWritten;

CONSOLE_SCREEN_BUFFER_INFO csbi; /* to get buffer info */

DWORD dwConSize; /* number of character cells in

the current buffer */

/* get the number of character cells in the current buffer */

bSuccess = GetConsoleScreenBufferInfo( hConsole, &csbi );

PERR( bSuccess, "GetConsoleScreenBufferInfo" );

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

/* fill the entire screen with blanks */

bSuccess = FillConsoleOutputCharacter( hConsole, (TCHAR) ' ',

dwConSize, coordScreen, &cCharsWritten );

PERR( bSuccess, "FillConsoleOutputCharacter" );

/* get the current text attribute */

bSuccess = GetConsoleScreenBufferInfo( hConsole, &csbi );

PERR( bSuccess, "ConsoleScreenBufferInfo" );

/* now set the buffer's attributes accordingly */

bSuccess = FillConsoleOutputAttribute( hConsole, csbi.wAttributes,

dwConSize, coordScreen, &cCharsWritten );

PERR( bSuccess, "FillConsoleOutputAttribute" );

/* put the cursor at (0, 0) */

bSuccess = SetConsoleCursorPosition( hConsole, coordScreen );

PERR( bSuccess, "SetConsoleCursorPosition" );

return;

}

 

这是我在CSDN里面看到的，并适当的做了添加：

/*清屏函数*/

#include <stdio.h>

#include <windows.h>

#define PERR(bSuccess, api){if(!(bSuccess)) printf("%s:Error %d from %s on line %d\n", __FILE__, GetLastError(), api, __LINE__);}

void MyCls(HANDLE) ;

inline void clrscr(void)

{

HANDLE hStdOut=GetStdHandle(STD_OUTPUT_HANDLE);

MyCls(hStdOut);

return;

}

void MyCls(HANDLE hConsole)

{

COORD coordScreen={0,0};//设置清屏后光标返回的屏幕左上角坐标

BOOL bSuccess;

DWORD cCharsWritten;

CONSOLE_SCREEN_BUFFER_INFO csbi;//保存缓冲区信息

DWORD dwConSize;//当前缓冲区可容纳的字符数

bSuccess=GetConsoleScreenBufferInfo(hConsole,&csbi);//获得缓冲区信息

PERR(bSuccess,"GetConsoleScreenBufferInfo");

dwConSize=csbi.dwSize.X * csbi.dwSize.Y;//缓冲区容纳字符数目

//用空格填充缓冲区

bSuccess=FillConsoleOutputCharacter(hConsole,(TCHAR)' ',dwConSize,coordScreen,&cCharsWritten);

PERR(bSuccess,"FillConsoleOutputCharacter");

bSuccess=GetConsoleScreenBufferInfo(hConsole,&csbi);//获得缓冲区信息

PERR(bSuccess,"ConsoleScreenBufferInfo");

//填充缓冲区属性

bSuccess=FillConsoleOutputAttribute(hConsole,csbi.wAttributes,dwConSize,coordScreen,&cCharsWritten);

PERR(bSuccess,"FillConsoleOutputAttribute");

//光标返回屏幕左上角坐标

bSuccess=SetConsoleCursorPosition(hConsole,coordScreen);

PERR(bSuccess,"SetConsoleCursorPosition");

return;

}

/*测试*/

void main(){

　　printf("1111") ;

　　clrscr() ;

}