Common dynamic memory allocation functions and operators
Function: Series C language function in the file stdlib.h provided
void * malloc（size_t）
void * calloc（size_t，size_t）
malloc does not initialize release will be initialized to zero calloc space, so in the pursuit of efficiency, the use of malloc
void * realloc（void * p，size_t size）
Step realloc function space applications:
1, the size of space applications size bytes
2, the value of p is just copied into the application space
3, p is released, return just the application space
Operator: new delete
int * pi = new int;
delete pi;
int * pi = new int [5];
delete [] pi;
※ When dynamic memory allocation by instantiating objects, new / delete will automatically call the constructor / destructor, and malloc / free not. Therefore, when the space allocated to the class, preferably using new / delete.
