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 integer constant literal 0 has different meanings depending upon the context in which it's used. In all cases, it is still an integer constant with the value 0, it is just described in different ways. If a pointer is being compared to the constant literal 0, then this is a check to see if the pointer is a null pointer. This 0 is then referred t... A NULL pointer in C is a pointer that doesn't point to any of the memory locations. The NULL constant is defined in the header files stdio.h, stddef.h as well as stdlib.h.
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