Question

Possible Duplicate:
How to convert a number to string and vice versa in C++

in csharp

string s1="12345"
string s2="54321"

public double (string s1,string s2)
{
  convert.todouble(s1) +convert.to-double(s2)
}

how i do in c++ because there is no conversion classs

Answer 1

Use boost::lexical_cast for example.

double func (const std::string& s1, const std::string& s2)
{
    return boost::lexical_cast<double>(s1) + boost::lexical_cast<double>(s2);
}

or use std::stringstream, strtod etc.