why malloc doesnot work in my c program?

 

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  • C, Malloc() and array length [duplicate] 4 answers
  • Do I cast the result of malloc? 27 answers

    • books is a pointer, who's size is 4. You can't read the size of your dynamically created "array".

    You'll see that malloc works, when it doesn't return NULL.

    它打印4，因为这是books的大小（即指针的大小）。

    替代方法：你可以使用一个struct BOOK数组，即struct BOOK books [5000];

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