int globalNum;

void doSomthing();

class testClass{
  public:
    testClass();
    int num

  protected:
    void setNum(int temp){num = temp;}
    int getNum(){return num;}
};

void main{
  globalNum = 5;
  testClass C;
}

void doSomething()
{
  C.setNum(globalNum);  // C undeclared (first use this function)
}