INTERVIEW QUESTIONS C C BASICS DETAILS

Question: What is the difference between NULL and NUL?

Answer: NULL is a macro defined in <stddef.h> 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 ‘’.

NULL is a macro defined in <stddef.h> 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 ‘’. Source: CoolInterview.com

basically NULL points the predefined value zero to the compiler !!
and NUL is the name of 1st character in the ASCII character set!! Source: CoolInterview.com

sizeof(NUL)=1 byte
sizeof(NULL)=4 byte Source: CoolInterview.com

NULL is a macro defined in <stddef.h> for the null pointer.


NUL is a user define variable Source: CoolInterview.com

basically NULL is predefined variable we can't defined value of NULL and NUL is defined by user its values changed by user time to time according its requirement. Source: CoolInterview.com

wew Source: CoolInterview.com

NULL = a macro defined in <stddef.h> for the null pointer.


NUL = a user define variable Source: CoolInterview.com

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