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Asked: 2026-05-25T20:58:00+00:00

In C, what is the difference between a NULL pointer and a pointer that

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In C, what is the difference between a NULL pointer and a pointer that points to 0?

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  1. Editorial Team

    The ISO/IEC 9899:TC2 states in 6.3.2.3 Pointers

    3 An integer constant expression with the value 0, or such an expression
    cast to type void *, is called a null pointer constant.55) If a null
    pointer constant is converted to a pointer type, the resulting
    pointer, called a null pointer, is guaranteed to compare unequal to a
    pointer to any object or function

    The macro NULL expands to an implementation-defined null pointer constant.

    Any two null pointers shall compare equal.

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