Why is there so much confusion surrounding null pointers? Why do these questions come up so often?
Posted by albert | Posted in PHP, Request | Posted on 16-11-2009
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I’m confused. NULL is guaranteed to be 0, but the null pointer is not?
Posted by albert | Posted in PHP, Request | Posted on 16-11-2009
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How do I “get” a null pointer in my programs?
Posted by ma.vinothkumar | Posted in PHP, Request | Posted on 16-11-2009
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A constant 0 in a pointer context is converted into a null pointer at compile time. A “pointer context” is an initialization, assignment, or comparison with one side a variable or expression of pointer type, and (in ANSI standard C) a function argument which has a prototype in scope declaring a certain parameter as being of pointer type. In other contexts (function arguments without prototypes, or in the variable part of variadic function calls) a constant 0 with an appropriate explicit cast is required.
