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what is the difference between NULL & NUL keywords in C?
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NULL is a macro defined in for the null pointer.
NUL is the name of the first character in the ASCII
character set. It corresponds to a zero value. There's no
standard macro NUL in C, but some people like to define it.
The digit 0 corresponds to a value of 80, decimal.
Don't confuse the digit 0 with the value of '' (NUL)!
NULL can be defined as ((void*)0), NUL as ''.
| Is This Answer Correct ? | 19 Yes | 3 No |
Answer / abhijit
NULL is a macro defined in <stddef.h> for the null pointer.
<br>NUL is the name of the first character in the ASCII
character set. It corresponds to a zero value. There?s no
<br>standard macro NUL in C, but some people like to define
it. <br>The digit 0 corresponds to a value of 80, decimal.
Don?t confuse the digit 0 with the value of ?? (NUL)!
<br>NULL can be defined as ((void*)0), NUL as ??. <br>
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| Is This Answer Correct ? | 17 Yes | 5 No |
Answer / bryan olson
Neither NULL nor NUL is a keyword in C.
[International Standard ISO/IEC 9899:1999, Programming
Languages -- C, Section 6.4.1 Keywords]
That said, Abhijit did a good job explaining them.
| Is This Answer Correct ? | 6 Yes | 9 No |
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