stringstream >> assignment

[Jeffrey Walton]

On Wed, Jul 6, 2011 at 3:12 AM, eric <fsshl@att.net> wrote:
> Dear advanced g++ program:
>
>  I copied a simple template and streamstring code from book, c++
> cookbook, at chapter 3 section 5.pg131: Parsing a string containing a
> Number in Scientific Notation.
> -----------------------------------------------------------
> #include <iostream>
> #include <sstream>
> #include <string>
>
> using namespace std;
>
> //double sciToDub(const string& str) {
>  template<typename T>
>  T strToNum(const string& str) {
>
>  stringstream ss(str);
>  T tmp;
>  ss >> tmp;
>
> [SNIP]
>
>  }
>  catch (string& e) {
>    cerr << "Whoops: " << e << endl;
>  }
> }
> ------------------------------------------------
> my test result is all 4 output is 7
> why is that, especially first two, double and float?
comp.lang.c++ is probably a more appropriate group.