Which header file should be included to use functions like malloc() and calloc()?

A. memory.h

B. stdlib.h

C. string.h

D. dos.h

Correct Answer is :

B. stdlib.h

Explanation

 In C, you should include stdlib.h. This will give you the function prototypes for the family of malloc functions (malloc, calloc, realloc, and free). Some compiler vendors provide access to these functions through other header files as well, but stdlib.h is the most portable one to use.