tsinghua university principle of compiler decaf programming assignment 1

写一个父类图形（Shape）（无属性，方法：计算周长，计算面积）， 两个子类：矩形（Rect 属性：长，宽；方法：计算周长，计算面积）, 圆形（Circle 属性：半径 方法：计算周长，计算面积） 并写一个测试类TestShape,含main方法，创建各个类的对象，用参数化构造方法为属性赋值，输出各个图形的周长和面积。-Write a parent class graphics (Shape) (no properties, methods: calculating p

repeat C until E This assignment aske you to extend the triangle langusge processor with additional loop of repeat-command-It is executed as follows. The subcommand is executed as follows. The subcommand is executed as follows. The subcommand is