在图形模式下显示鼠标，以鼠标坐标位置为基准点在屏幕上画一条纵贯屏幕的垂直线和一条横贯屏幕的水平直线。当鼠标移动时，两条直线也跟着移动。当按下鼠标右键时停止程序运行-In graphics mode mouse to the mouse coordinates of the location for the reference point on the screen draw a vertical line runs through the screen and a straight line r