string与double的互相转换

#include <iostream>  
#include <string>  
#include <sstream>  

string DoubleToString(double Input)  
{  
    stringstream Oss;  
    Oss<<Input;  
    return Oss.str();  
}  

double StringToDouble(string Input)  
{  
    double Result;  
    stringstream Oss;  
    Oss<<Input;  
    Oss>>Result;  
    return Result;  
}