fft的文件，fortran环境下运行！欢迎指正！

2维fft程序，包括fortran和c语言

用fortran法编写的二维数组的傅立叶变换程序，用户可根据需要编写输入和输出程序，这里只给出程序主体部分-Written using two-dimensional array fortran method of Fourier transform procedure, the user may need to write the input and output procedures, the main part of the program are given here only