I attempted to learn C++ through "C++ For Dummies," but I soon got bored a few chapters into the book learning all of the same stuff that I did in GS2, I'll try to attempt for some online tutorials, and I'm currently downloading MS Visual C++. 
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if you think you learned the same stuff as gs2 then I think you are missing out on many things. I don't know c++, but I think you have to allow/remove memory,make sure a variable is signed/unsigned, choose a data type like float/double/int/long, and much more.