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what does the _t appended to the name of some datatypes mean? It seams that it is used for datatypes that might vary in size depending on the system. for instance a pointer. is this correct?
Yup - that's correct! They are indeed "datatypes", and a primary motivation for declaring the type (rather than just using the raw, built-in type) is to maintain portability (among other things, portability for different sizes).
Strictly speaking, the "_t" usually means there's a "typedef".
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