In realloc(ptr, size), what happens if the size is set to zero?
Question
In realloc(ptr, size), what happens if the size is set to zero?
Solution
In the realloc function, if the size is set to zero, it is equivalent to the function free(ptr). This means that the memory previously allocated at the pointer ptr is deallocated or freed, making it available for further allocations. However, the behavior is implementation-defined: realloc may return NULL or some other valid pointer. If it returns a non-null pointer, you should not use it, as its content is indeterminate. It's always a good practice to check the returned pointer from realloc, even when you're reducing the size to zero.
Similar Questions
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