stringstream

[Mertovun]

Hi. By following the tutorials, i cannot understand the advantage that stringstream provides.

The example code at the tutorial about stringstream:

#include <iostream>
#include <string>
#include <sstream>
using namespace std;

int main ()
{
  string mystr;
  float price=0;
  int quantity=0;

  cout << "Enter price: ";
  getline (cin,mystr);
  stringstream(mystr) >> price;
  cout << "Enter quantity: ";
  getline (cin,mystr);
  stringstream(mystr) >> quantity;
  cout << "Total price: " << price*quantity << endl;
  return 0;
}

But i think that the following code does the same work.

#include <iostream>
#include <string>
using namespace std;

int main ()
{
  float price=0;
  int quantity=0;

  cout << "Enter price: ";
  cin>>price;
  cout << "Enter quantity: ";
  cin>>quantity;
  cout << "Total price: " << price*quantity << endl;
  return 0;
}

The second code is simplier and it seems it does the same work. What is the difference? And I actually does not understand the stringstream() and getline() expressions too. Can anybody explain it Or give another basic example about this issue? Thanks a lot.

[guestgulkan]

Another thread on exactly the same topic here at almost exactly the same time:
http://www.cplusplus.com/forum/beginner/3951/