Is it a build-in function?

Dear all,

This is my first time to post message here. I'm glad to see you all here.

I have met a function called Malloc. There is a line as below:
#define Malloc(type,n) (type *)malloc((n)*sizeof(type))

I don't know whether it is a build-in function or not. Also, what is its function?

Thanks for solving my problem.

Using `new' for C++ lang need no headers.
But malloc() for C lang needs <stdlib.h> included.