std::string 和 int之间的相互转换

This question is asked quite often, so here is a way of doing it using  stringstream :

number to string

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int Number = 123;//number to convert int a string string Result;//string which will contain the result stringstream convert; // stringstream used for the conversion convert << Number;//add the value of Number to the characters in the stream Result = convert.str();//set Result to the content of the stream //Result now is equal to "123"

string to number

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string Text = "456";//string containing the number int Result;//number which will contain the result stringstream convert(Text); // stringstream used for the conversion initialized with the contents of Text if ( !(convert >> Result) )//give the value to Result using the characters in the string Result = 0;//if that fails set Result to 0 //Result now equal to 456

Simple functions to do these conversions

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template string NumberToString ( T Number ) { stringstream ss; ss << Number; return ss.str(); }

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template T StringToNumber ( const string &Text )//Text not by const reference so that the function can be used with a { //character array as argument stringstream ss(Text); T result; return ss >> result ? result : 0; }

原文地址：
http://www.cplusplus.com/forum/articles/9645/

也可以参考这个：
http://stackoverflow.com/questions/191757/c-concatenate-string-and-int