What to do with a source code?

I just downloaded a source code from http://8325.org/sudoku/source.html i clicked on the link solver.cc. i am able to open it with Microsoft visual c++ 2010 express. the debug button wouldn't work so i took the text itself and copied it, created a new project, then pasted it as my code. i was able to debug it, but there were a whole bunch of errors. what exactly am i supposed to do with source code? i want to make it work so i can use it. i only have a very basic understanding of the c++ language. i'm just barely touching on multidimensional arrays right now.
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