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. The C standard defines that 0 cast to the type void * is both a null pointer and a null pointer constant. Additionally, to help readability, the macro NULL is provided in the header file stddef.h. Jan 12, 2024 · A null pointer constant may be converted to any pointer type; such conversion results in the null pointer value of that type.
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