这是一个字符串处理函数集，包括： IsNumeric——检查串是否为数字串 Upcase——变成大写串 Lowercase——变成小写串 Trim——截掉串尾的空格 RTrim——截掉串开始处的空格 LTrim——截掉串尾的空格 right——从右到左截掉字符 left—— 从左到右截掉字符 mid——截掉从某个起始位置到右边位置的字符 zip文件中包含StringFunctins.h和StringFunctins.cpp是字符串处理函数的头文件和实现文件，main.cpp和main.h是一个控制台应用程序的头和实现，示范字符串处理函数的使用方法。-this a string functions,include:IsNumeric-check_up if the string is Numeric,Upcase-change to capital string,Lowercase-change to small string,Trim-cut blank of string tail,right-cut character from right to left,left-cut character from left to right,mid-cut character from mid to right,the zip file include StringFunctions.h and StringFunctions.cpp,which is using for string functions,main.cpp and main.h are head and implement of a console program,it demonstate the way of using string functions.