c++ class why need main?

Question

Hello I\'m writing a little project in c++ where I would like to have some classes that does some work, I wrote the interfaces and the implementation of the classes.

The

Answer 1

You should either compile them together (in a single g++ command) or compile both of them to object files (g++ -c) and then use ld to link the object files together.

Sample Makefile:

all: app.exe

app.exe: app.o animal.o
    g++ -o app.exe app.o animal.o

app.o: app.cpp
    g++ -c -o app.o app.cpp

animal.o: animal.cpp animal.h
    g++ -c -o animal.o animal.cpp