识别一个输入的字符串是否是十六进制数 如果是将其转换成等值的十进制数-Identify whether an input string is a hex number if it is converted into its equivalent decimal number

将一个十六进制的字符串转换成它的等价的十进制数值。主函数负责收集字符，并判别它们是否为十六进制字符，htoi函数负责转换工作-to a hexadecimal string converted into its equivalent of the decimal value. The main function responsible for the collection of characters, and for judging whether the hexadecimal charact

字符串转换成十六进制字符串，一个小工具类-String converted to hexadecimal strings