memory allocation

1 malloc与free是C++/C语言的标准库函数，new/delete是C++的运算符。

2,malloc, 必须 包含头文件<stdlib.h>

3,

nt* p_scalar =new int(5);//Does not create 5 elements, but initializes to 5
int* p_array =new int[5];//Creates 5 elements

delete[] p_array;