编写一个程序，用于根据用户输入的命令行参数数量来计算长方形、正方形、三角形的面积。如果输入的参数为一个、二个、三个则它们应分别对应正方形、长方形、三角形，如果没有参数，则通过异常处理方法现实错误消息-Write a program based on user input for command line parameters to calculate the number of rectangular, square, triangle area. If the input parameters to one, two, three then they should correspond to a square, rectangle, triangle, if no parameters, exception handling approach reality through the error messages