头文件graphics.h包含cleardevice()函数,该函数在图形模式下清除屏幕并将当前位置设置为(0,0)。清除屏幕包括用当前背景色填充屏幕。
句法 :
void cleardevice();
以下是C中cleardevice()的实现:
// C Implementation for cleardevice()
#include
// driver code
int main()
{
// gm is Graphics mode which is
// a computer display mode that
// generates image using pixels.
// DETECT is a macro defined in
// "graphics.h" header file
int gd = DETECT, gm;
// initgraph initializes the
// graphics system by loading a
// graphics driver from disk
initgraph(&gd, &gm, "");
// set the background colour as GREEN
setbkcolor(GREEN);
// outtext function displays
// text at current position.
outtext("Press any key to clear the screen.");
getch();
// cleardevice function
cleardevice();
outtext("Press any key to exit...");
getch();
// closegraph function closes the
// graphics mode and deallocates
// all memory allocated by
// graphics system .
closegraph();
return 0;
}
输出:
执行程序时,输出窗口如下所示: 在按任意键时: 要退出,请按任意键。
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