Thread: C++/ C question
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Member Since: Mar 15, 2007
Posts: 161
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The 0x prefix tells the compiler that the number value "ffff" is given in base 16 (hexadecimal) rather than base 10 (decimal). In hexadecimal, A through F are digits just like 0 through 9.

To understand this better, I recommend reading at least the first 1/3 or so of the Wikipedia page on hexadecimal.
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