How to Separate C Class Declarations and Member Function Implementations into Header and Source Files?

Separating Class and Member Functions into Header and Source Files

In C , classes can be declared and implemented in separate header and source files. This allows for easier management and organization of code.

Class Declaration in Header File:

The header file (.h) contains the class declaration, which includes the name, data members, and member function prototypes. Include guards are used to prevent multiple inclusions.

// A2DD.h
#ifndef A2DD_H
#define A2DD_H

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

#endif

Class Implementation in Source File:

The source file (.cpp) contains the implementation of the class's member functions. The functions are defined using the class's scope operator (::).

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

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

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

Syntax for Using the Class:

To use the class, include the header file in the main file. Instantiation of the class and access to its member functions is done as follows:

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

int main()
{
  A2DD a(1, 2);
  int sum = a.getSum();
  return 0;
}

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