Can makefile allow me to compile programs I modify and see on my screen ?

I can use « make » in order to compile programs written on my disk. But when I modify a program, I should like, not to register it, before I compile it with « make ».
I suppose I can compile the program I have on my screen, instead of that one I have on my disk. So, it will go much qicker.
I should like, somebody gives to me an example of a makefile that avoids registering, before compiling. Thanks

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