Introduction - If you have any usage issues, please Google them yourself
This case, the definition of the structure of stu, the definition of a pointer variable stu type ps. Stu and then the distribution of a large memory area, and the first address given to ps, so that point to the region ps. Ps and then the pointer to point to structure member variables of the assignment, and the members of printf output value. Free function with the release of the final point of the memory space ps. The whole process includes an application memory space, the use of memory space, a three-step release of memory space and realize the dynamic allocation of storage space.