How Can I Separate Class Implementation from Declarations in C ?

Separating Class Implementation from Declarations

When working with complex classes, it's often beneficial to separate class implementation from its declarations for clarity and organization. To accomplish this, you can utilize header and source files.

Consider the following class as an example:

class A2DD
{
public:
  A2DD(int x, int y);
  int getSum();
};

In this scenario, the class declaration would reside in a header file. Header files use the .h extension and typically include class declarations and necessary include guards (#ifndef and #define).

// A2DD.h
#ifndef A2DD_H
#define A2DD_H

class A2DD
{
  int gx;
  int gy;

public:
  A2DD(int x, int y);
  int getSum();
};

#endif

The class implementation, on the other hand, would be placed in a source file with a .cpp extension. This file would contain the function definitions for the class methods.

// A2DD.cpp
#include "A2DD.h"

A2DD::A2DD(int x, int y)
{
  gx = x;
  gy = y;
}

int A2DD::getSum()
{
  return gx + gy;
}

By separating the declarations and implementation, you can keep your code organized and flexible. This approach allows you to modify the implementation details without altering the declarations, making it easier to maintain and update your codebase.

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