Web Reference: Jan 10, 2025 · Following are some most common uses of the NULL pointer in C: To initialize a pointer variable when that pointer variable hasn't been assigned any valid memory address yet. To check for a null pointer before accessing any pointer variable. May 10, 2020 · NULL is used to make it clear it is a pointer type. Ideally, the C implementation would define NULL as ((void *) 0) or something equivalent, and programmers would always use NULL when they want a null pointer constant. Many C functions return NULL when something goes wrong. For example, fopen() returns NULL if a file cannot be opened, and malloc() returns NULL if memory allocation fails.
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