Which regular expression will match the rules for a C++ identifier? (Letters, digits, underscore, cannot start with a digit)
A. [a-zA-Z_]+[a-zA-Z_0-9]*
B. [a-zA-Z_0-9]*
C. \w+
A. [a-zA-Z_]+[a-zA-Z_0-9]*
Computer Science & Information Technology
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How many bits are in an IPv4 address?
A) 32 B) 64 C) 128 D) 256
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________ are software systems that make using computers more convenient or users, application developers and system administrators.
a) Operating systems b) Applications c) GUIs d) None of the above.
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