Plugin <stdlib> works no more. What plugin instead ?

Hi all! My O.S. ubuntu Linux 16.04. My compiler GCC, belonging to Code::Block 13.12. My program : Echo Chess Program. My compiler says about #include<stdlib>: no such file or directory. My program is old of some years. What plugin shall I use instead of <stdlib> ??
> My compiler says: #include<stdlib>: no such file or directory.

C++: #include <cstdlib>

C: #include <stdlib.h>
Thank you very much. With <cstdlib> it's OK !!
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