Static field and public method

[probine]

For some reason this code doesn't work

class Media
{
private:
static int number;

public:
void addMediaType();
};

void Media :: addMediaType()
{
number=1;
}

How can I refer to my static number from my public method ?

[wysota]

How can I refer to my static number from my public method ?

Media::number = 1;

But you have to initialise it somewhere first. The initialisation should take place outside of any class member and should be done only once, something like that:

//header
class X{
  static int var;
};
 
//implementation
int X::var = 1;

//header
class X{
  static int var;
};

//implementation
int X::var = 1;

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