说明：  FFT(快速傅里叶变换)的算法,在VC++环境下编译可立即看到结果,本人认为具有很好的参考价值,欢迎下载^_^
(FFT (Fast Fourier Transform) algorithm, in the environment of VC++ compiler can immediately see the results, I think that has a very good reference value are welcome to download ^ _ ^)