这是一个求两圆弧相交点的程序。界面中有图区，操作及显示区。操作分为两个步骤： 1· 创建圆弧" 。 点击“创建圆槐按钮，可进入创建圆弧工作状态。进入创建圆弧工作状态以后，光标进入有坐标线的图区变为十字线，图区的下面显示光标坐标。在适当位置点击左键，这是圆弧的一个端点，有一个黑点显示在那里，同时把这点显示出来-This is a demand point of intersection of two circular process. Interface with map area, operation and display. Operation is divided into two steps: 1 Create arc. " Click on"　Create a round Huai button to create the arc into the working state. Create a working state into the arc after the coordinates of the cursor into a line graph area into a cross line, graph area shown below cursor coordinates. Click the left button at the appropriate location, which is an arc endpoint, there is a black spot appears in there, while this point is displayed