用 法:
void clrscr(void);
程式例:
#include <conio.h>
int main ()
{
int i;
clrscr();
for (i = 0; i < 20; i++)；
cprintf("%d\r\n", i);
cprintf("\r\nPress any key to clear screen");
getch();
clrscr();
cprintf("The screen has been cleared!");
getch();
return 0;
}
注意：
①只有在Turbo C 中可以運行 ！
②在Turbo C++ 中，需要先另外儲存為（save as）.C格式，才能使用。
另解：
在VC中無法調用該函式，有下列辦法：
1. #include <stdlib.h>
system("cls");
這種辦法的缺點是程式額外運行系統程式執行清屏操作，延長了程式執行時間。
2.自己寫函式，這種辦法比較快。
這是從微軟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;
}
或者
/*清屏函式*/
#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};//設定清屏後游標返回的螢幕左上角坐標
BOOL bSuccess;
DWORD cCharsWritten;
CONSOLE_SCREEN_BUFFER_INFO csbi;//保存緩衝區信息
DWORD dwConSize;//當前緩衝區可容納的字元數
bSuccess=GetConsoleScreenBufferInfo(hConsole,&csbi);//獲得緩衝區信息
PERR(bSuccess,"GetConsoleScreenBufferInfo");
dwConSize=csbi.dwSize.X * csbi.dwSize.Y;//緩衝區容納字元數目
//用空格填充緩衝區
bSuccess=FillConsoleOutputCharacter(hConsole,(TCHAR)' ',dwConSize,coordScreen,&cCharsWritten);
PERR(bSuccess,"FillConsoleOutputCharacter");
bSuccess=GetConsoleScreenBufferInfo(hConsole,&csbi);//獲得緩衝區信息
PERR(bSuccess,"ConsoleScreenBufferInfo");
//填充緩衝區屬性
bSuccess=FillConsoleOutputAttribute(hConsole,csbi.wAttributes,dwConSize,coordScreen,&cCharsWritten);
PERR(bSuccess,"FillConsoleOutputAttribute");
//游標返回螢幕左上角坐標
bSuccess=SetConsoleCursorPosition(hConsole,coordScreen);
PERR(bSuccess,"SetConsoleCursorPosition");
return;
}
/*測試*/
int main()
{
printf("1111") ;
clrscr() ;
return 0;
}
