Global screen write subroutine nesting level 全局屏幕写子程序嵌套层次
These methods use the subroutine to establish the Auto CAD drawing instruction set. The subroutine can be called by the main program, and users can program this subroutine by using high level languages or dBASE ⅲ. 文中给出的方法采用子程序方式建立AUTOCAD的绘图命令集,用户可以用高级语言或dBASEⅢ描述绘图命令子程序集,供主程序调用。
Besides, two level subroutine nesting is provided by two level stack. 而且由两级堆栈提供了两级子程序嵌套。