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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.
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You don't necessarily
have to make sure a variable is unsigned/signed and you don't really have to zero memory/declare pointers to a certain memory location for simple applications, but yes, variable types have to be declared before they are used.