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
", i);
}
cprintf("
Press 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
", __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
", __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() ;
}