编写一个函数，设计给定３ＤＢ点的ＩＩＲ滤波器，这样的方法简单方便-The preparation of a function, the design of a given 3DB point IIR filters, this method is simple and convenient

利用c++编写了一个外点惩罚函数，用于对于对目标值的推算与尝试。-Use c++ to write a point outside the penalty function for the target value for the calculation and try.

在c下实现了PL0编译器的实现，并且扩充了write和for功能，增加了数组和浮点数的定义，功能更加强大(Under C, the implementation of PL0 compiler is realized, and the functions of write and for are extended. The definition of array and floating point number is added, and the function is more powerf