C - Pointer memory allocation [duplicate]

问题

This question already has answers here:

Why do we cast return value of malloc? [duplicate] (4 answers)

Do I cast the result of malloc? (26 answers)

Closed 4 years ago.

Can someone please explain to me the difference between

int *x = malloc(sizeof(int));

&&

int *x = (int*)malloc(sizeof(int));

Thanks!

回答1:

The difference is that you are casting the return of malloc() in the second example. malloc() returns a void* pointer, which is automatically and safely promoted to any other pointer type in this case.

Therefore casting in this case is not required and should not be done. Check here.

来源：https://stackoverflow.com/questions/33798608/c-pointer-memory-allocation