C - Pointer memory allocation [duplicate]

问题:

This question already has an answer here:

• Why do we cast return value of malloc? [duplicate] 4 answers
• Do I cast the result of malloc? 26 answers

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.