浮点数转换字符程序，支持前面填充0，符号，程序简短，效率高-float to char ,support fill zero and symbol ,short program

单片机在通信中，浮点数的处理往往容易出错，本代码解决单片机通信时的浮点数据转换处理，包括浮点数转换成char ,和char转成float类型(The processing of floating point data is often prone to make mistakes in the communication of single chip microcomputer. This code solves the floating point data conversion proces