#include <windows.h>
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);
	//printf("ok");
	//PERR(bSuccess, "SetConsoleCursorPosition");
	return;
}
inline void back2zero(void)
{
	static HANDLE hStdOut = GetStdHandle(STD_OUTPUT_HANDLE);
	static COORD coordScreen = { 0, 0 };
	SetConsoleCursorPosition(hStdOut, coordScreen);
}
inline void clrscr(void)
{
	HANDLE hStdOut = GetStdHandle(STD_OUTPUT_HANDLE);
	MyCls(hStdOut);
	return;
}