内存的使用

/*
跨函数使用内存
无论是主函数还是调用函数，变量所申请的内存空间在代码块结束或者程序结束之后，内存自动释放。
而通过malloc向操作系统动态申请的内存，则需要通过free来释放内存空间。
*/

#include<stdio.h>
#include<malloc.h>
struct Student {
	int age;
	int id;
};

struct Student* CreateStudent();
void ShowStudent(struct Student *ps);

int main() {
	struct Student *ps;
	ps = CreateStudent();
	ShowStudent(ps);

	return 0;
}

struct Student *CreateStudent() {
	struct Student* ps = (struct Student *)malloc(sizeof(struct Student));
	ps->age = 99; 
	ps->id = 101;
	return ps;
}
void ShowStudent(struct Student *ps) {
	printf("%d %d\n", ps->age, ps->id);
	free(ps);
}