已知巴特沃思幅度平方函数,可以求得Ha函数在S左半平面的N时极值点Sk。由题意，试设计一通用程序，由键盘输入H1.W1，和H2，W2。求c,N和Sk值。-Known the Butterworth magnitude squared function, we can obtain the Ha function in the left half-plane S N when extreme points Sk. By the meaning of the questions, try to design a general program, by the keyboard input H1.W1, and H2, W2. Find the value of c, N and Sk.