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Ive tried searching in Google for explanation on this but sadly i got none.
Do not expect explanation for the full code, just for 1 line at the time, then you will have to put things together.
The code is a black box to you, open the box with a debugger.
There is an almost universal solution: Run your code on debugger step by step, inspect variables.
The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't know what your code is supposed to do, it don't find bugs, it just help you to by showing you what is going on. When the code don't do what is expected, you are close to a bug.
To see what your code is doing: Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute.
Debugger - Wikipedia, the free encyclopedia[
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Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[
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Basic Debugging with Visual Studio 2010 - YouTube[
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1.11 — Debugging your program (stepping and breakpoints) | Learn C++[
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The debugger is here to only show you what your code is doing and your task is to compare with what it should do.