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Home/ Questions/Q 636759
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Editorial Team
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Editorial Team
Asked: May 13, 20262026-05-13T20:33:00+00:00 2026-05-13T20:33:00+00:00

What happens inside memory if we try to free a pointer which is pointing

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What happens inside memory if we try to free a pointer which is pointing to NULL?
Is that ever valid?

Why does it not show any warning/error messages?

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  1. Editorial Team
    Editorial Team
    2026-05-13T20:33:00+00:00Added an answer on May 13, 2026 at 8:33 pm

    From C99 section 7.20.3.2 : The free function

    Synopsis

     1 #include <stdlib.h>
       void free(void *ptr);
    

    Description

    2 The free function causes the space pointed to by ptr to be deallocated, that is, made
    available for further allocation. If ptr is a null pointer, no action occurs.

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