Using headers .h and implementation files

A typical object oriented program will have:

1.     myfirst.h - the header include file
2.     myfirstlib.cpp  - the implementation, compiled to myfirstlib.o
3.     myfirst - the compiled (and linked program)

Example:

// This will be #include "myfirst.h"
class myfirstClass {
public:
    int a_number;
    void my_func01();
};

// This would be in the myfirstlib.o library, the implementation
void myfirstClass::my_func01() {
    std::cout << "This is in my_func01" << std::endl;
}

// And this of course the main body
#include <iostream>
int main() {
    myfirstClass mine;
    mine.my_func01();

}

The Makefile when you have headers and libraries

So the Makefile would need entries for this like so:

bin/running :    bin/myfirst.o    bin/myfirstlib.o
    $(CC) -o bin/myfirst  bin/myfirst.o bin/myfirstlib.o
bin/myfirstlib.o : src/myfirstlib.cpp  include/myfirst.h
    $(CC) -c -o bin/myfirstlib.o   src/myfirstlib.cpp
bin/myfirst.o : src/myfirst.cpp include/myfirst.h
    $(CC) -c -o bin/myfirst.o src/myfirst.cpp

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