[Solved] Where and how to define member variables? In header or implementation file?

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You don’t need to re-declare the class in the .cpp file. You only need to implement its member functions:

#include "Mems.h"
#include <iostream> // only required for the std::cout, std::endl example

Mems::Mems() : n(42)  // n initialized to 42
{
  std::cout << "Mems default constructor, n = " << n << std::endl;    
}

Note that usually you want the default constructor to be public. Members are private by default in C++ classes, and public in structs.

class Mems
{
 public:
  Mems();
 private:
  int n;
};

solved Where and how to define member variables? In header or implementation file?