The null coalescing operator (called the Logical Defined-Or operator in Perl) is a binary operator that is part of the syntax for a basic conditional expression in several programming languages, including C#, Perl as of version 5.10, Swift, and PHP 7.0.0.
In this manner, what is null in C language?
C. In C, two null pointers of any type are guaranteed to compare equal. The preprocessor macro NULL is defined as an implementation-defined null pointer constant, which in C99 can be portably expressed as the integer value 0 converted implicitly or explicitly to the type void* (pointer to void).
How NULL is defined in C?
The C library Macro NULL is the value of a null pointer constant. It may be defined as ((void*)0), 0 or 0L depending on the compiler vendor.
Is there a null in C?
In C, it is implemented as int , so, it's the same as 0, which is of INT_TYPE_SIZE . In C++, character literal is implemented as char , which is 1 byte. This is normally different from NULL or 0 . Next, NULL is a pointer value that specifies that a variable does not point to any address space.