[Dev-C++] Including Function From Other .cpp files

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I am converting some code from various other programming languages into C++. 
However, I really want to build a library of functions within various C++ 
files. However, I am not certain how to call functions from different cpp 
files.

I assume include the .cpp file. However, do I put the function prototype in 
the code calling the function or leave everything in my functions.cpp file?

Any help, advise and pointers would be greatly appreciated...

Thanks..