The C (and, by inheritance of accummulated features, C++, Perl, Python, Java, and who knows what other UN*Xoid tools) prefix for a hexadecimal numeric literal. In other words, 0x123 == 291 in C.

It's not a computer science thing at all, just a convention in a part of the computing world which has grown very large in the past few years. Most assemblers used $, BBC BASIC used &, and even an H suffix have been used.

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