can easily get around it by supplying -Wl,--allow-multiple-definition to the linker flags.
Sorry I just started to use C:B but could you clarify how exactly I can do that, please?
If you have multiple definitions of main, this will most likely not help.
You will not be able to get a working executable.
Maybe you should buy you a good book about programming, or search the web for a good tutorial.
If you do not understand what you do, you will never be able to make it work.