此程式具有三种FFT演算法,分别是radix-2 radix-4 radix-8,可选择其中一种演算法,接着输入FFT点数,程式就会执行FFT/IFFT,可以藉此知道是否正确-This program has three FFT algorithms are radix-2 radix-4 radix-8, can choose one algorithm, and then enter the FFT points, the program will be the implementation