c - malloc handling - identifier not found issue

Question

I'm using visual studio to write a c code.

This is the malloc code line i was told to use:

root = (Coor)malloc(sizeof(Coor));

It doesn't let me use it for the following error:

identifier not found

Can anyone tell me why it happens and how to fix it?

Thanks,

Answer 1

请检查您是否已包含<stdlib.h>和<malloc.h>。