sstream

#include<string>#include<sstream>#include<iostream>using namespace std;//C++方法，将数值转化为string。string converttostring(double x){    ostringstream o;if(o<<x)return o.str();return "error";}//C++方法，将string转化为数值。double convertfromstring(const string &s){    istringstream i(s);double x;if(i>>x)return x;return 0.0;}int main(int argc,char* argv[]){    char b[10];string a;//将数值转化为string的C语言方法。sprintf(b,"%d",1957);a=b;cout<<a<<endl;string cc=converttostring(1976);cout<<cc<<endl;string dd="2006";int p=convertfromstring(dd)+2;cout<<p<<endl;return 0;}