error LNK2001: unresolved external symbol "public: static bool A::myvar" (?myvar@A@@2_NA)

I'm not clear on why I get that error on this piece of code:

#include "stdafx.h"

class A {
public:
      static bool myvar;
};

int _tmain(int argc, _TCHAR* argv[])
{
      A::myvar = true;
      return 0;
}

Thanks!
LVL 2
rustycpAsked:
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brendanmeyerCommented:
#include "stdafx.h"

class A {
public:
      static bool myvar;
};

bool A::myvar;


int _tmain(int argc, _TCHAR* argv[])
{
      A::myvar = true;
      return 0;
}

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you have declared the bool, but didn't define it. (added line 8)
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rustycpAuthor Commented:
ok simple enough...thx!
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