快速傅立葉變換是離散傅立葉變換的快速演算法，也可用於計算離散傅立葉變換的逆變換。快速傅立葉變換有廣泛的應用，如數位訊號處理、計算大整數乘法、求解偏微分方程等等。-Fast Fourier transform is a fast discrete Fourier transform algorithm can also be used to calculate the discrete Fourier transform of the inverse transform. Fast Fourier

一组转换函数用于十六进制字符串二进制字符串八进制字符串到十进制整数相互转换(A set of transition function for hexadecimal string octal binary string string to a decimal integer transform each other)