In the programming languages C and C++, the unary operator sizeof is used to calculate the size of any datatype, measured in the number of bytes required to represent the type. A byte in this context is the same as an unsigned char, and may be larger than 8 bits, although that is uncommon. The result of sizeof is the size of the type of the expres...
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http://en.wikipedia.org/wiki/Sizeof
operator yielding the size of an object.
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http://www.stroustrup.com/glossary.html
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