Thread: Newbie problem with classes

Hi guys,

I have found some sample code on the internet and was playing around with it in order to understand what it does, using CodeBlocks. The code is for the class is:

Code:

#ifndef EUROPEANOPTION_H_INCLUDED
#define EUROPEANOPTION_H_INCLUDED

#include <string>

class EuropeanOption
{
private:

   void init();   // Initialise all default values
   void copy(const EuropeanOption& o2);

   // 'Kernel' functions for option calculations
   double CallPrice() const;
   double PutPrice() const;
   double CallDelta() const;
   double PutDelta() const;


public:
   // Public member data for convenience only
   double r;      // Interest rate
   double sig;      // Volatility
   double K;      // Strike price
   double T;      // Expiry date
   double U;      // Current underlying price
   double b;      // Cost of carry

   string optType;   // Option name (call, put)

};

However, I am getting the following error on the last line: 'string' does not use name type.

Am I calling the <string> class incorrectly? Also how does CodeBlocks add classes like string and math.h? Do I have to install them or are they already in CodeBlocks?

There is no such thing as a string. There is such a thing as a std::string, however.

If you don't like typing std::string, and want to type string instead, then you can put

Code:

using namespace std;

somewhere above that line, which essentially will tack on std:: in front of words that the compiler would otherwise complain about. (However, such a thing is generally frowned upon in .h files.)

fixed it, thanks!

one more question though, are there any statistical classes similar to math.h? I'm guessing I would probably have to write something myslef to get normal distribution p-values?

I don't know the contents of tr1 off the top of my head, but that was supposed to introduce some large quantity of statistical-type things. You may want to check there.