Null pointer

In computing, a null pointer (sometimes shortened to nullptr or null) or null reference is a value saved for indicating that the pointer or reference does...

often occur because of errors in pointer use, particularly in C dynamic memory allocation. Dereferencing a null pointer, which results in undefined behavior...

representation. Null device, a virtual file that discards data written to it, on Unix systems /dev/null Null pointer or reference (sometimes written NULL, nil,...

garbage collection. A null pointer has a value reserved for indicating that the pointer does not refer to a valid object. Null pointers are routinely used...

syntax for null-terminated strings with associated handling in its standard library Supports low-level access to computer memory via pointers Supports procedure-like...

never again be used, no code will try to access the null pointer, and because the pointer is null, its memory is not deleted when it goes out of scope...

system is able to detect run-time references to null pointers, a solution to the above is to assign 0 (null) to dp immediately before the inner block is...

following limits on programs: NULL checks are inserted to prevent segmentation faults Pointer arithmetic is limited Pointers must be initialized before use...

null pointer to his design of the ALGOL W language and called it a "mistake": I call it my billion-dollar mistake. It was the invention of the null reference...

concept of a null pointer to denote a pointer that does not refer to any valid data. The macro NULL is often used in place of a null pointer, relying on...