Why am I getting this error?

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C++

i have declared a class node. When i am declaring a global variable head i am getting an error but when i am declaring it in main() i compile successfully.

class Node
{
public:
    int data;
    Node* next;
};
Node *head;
head=NULL;

int main()
{

    Node *temp= new Node;
    temp->data=5;
    temp->next=NULL;
    head=temp;
    cout << "head->data= "<<head->data<<" head->next= "<<head->next;

    return 0;
}

error= 'head' does not name a type