Thread: classes won't execute

hey,
I just did the tutorial on classes.
when I compile it says 0 errors, but the button to execute the program is disabled.

Code:

#include <stdio.h>
#include <iostream>
#include <string>
#include <fstream>
#include <cstdlib>
using namespace std;
class computer
{
 public:
 computer();
 ~computer();
 void setSpeed( int p);
 int readSpeed();
 protected:
 int processorspeed;
};
  computer::~computer()
  {
  }
void computer::setSpeed ( int p )
{
  processorspeed = p;
}
int computer::readSpeed()
{
return processorspeed;
}
int main(int argc, char *argv[])
{
computer compute;
  return 0;
}

When I take computer computer; out of main it lets me execute. Any ideas?

where do I put it?

If you don't supply a constructor for your class, C++ will supply a 'default constructor', which will allow you to create objects of that class. However, if you list a constructor for your class, then C++ won't supply a 'default constructor'. In your class, you have this line:

computer();

which is a constructor, so C++ doesn't supply you with a default constructor. You can tell it's a constructor because it has no return type and it has the same name as the class. Regular functions have to have a return type. Since you never defined your constructor, i.e. you never told the compiler how you want your objects to be created, your program doesn't work.