调用系统的正逆傅里叶改写成类

............................\Debug
............................\.....\FFTs.obj
............................\.....\FFTs.sbr
............................\.....\StdAfx.obj
............................\.....\StdAfx.sbr
............................\.....\testFFT.exe
............................\.....\testFFT.obj
............................\.....\testFFT.pdb
............................\.....\testFFT.sbr
............................\.....\vc60.pdb
............................\FFTs.cpp
............................\FFTs.h

............................\ReadMe.txt
............................\StdAfx.cpp
............................\StdAfx.h
............................\testFFT.cpp
............................\testFFT.dsp
............................\testFFT.dsw
............................\testFFT.ncb
............................\testFFT.opt
............................\testFFT.plg