通过汇编完成DOS环境下的杨辉三角的打印。

程序应有操作提示、输入和输出，界面追求友好，最好是菜单式的界面。

设计若干用例（测试数据），上机测试程序并分析（评价）所设计的程序。-Completed by compiling DOS environment Yang Hui triangle print. Operating procedures should be prompt, input and output, the pursuit of friendly interface, preferably menu-driven interface. The design of a number of use cases (test data), on test procedures and analysis (evaluation) of the design process.