四、跨函数使用内存讲解及其示例

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1. #include <stdio.h>

2. #include <malloc.h>

3. struct Student

4. {

5. int age;

6. int sid;

7. };

8. struct Student * CreateStudent();

9. void ShowStudent(struct Student *);

10. int main(void)

11. {

12. struct Student * ps;

13. ps = CreateStudent();

14. ShowStudent(ps);

15. return 0;

16. }

17. //因为返回的是指针p，它的类型为struct Student

    *，所以方法前面要加这个

18. struct Student * CreateStudent(void)

19. {

20. struct Student * p = (struct Student *)malloc(sizeof(struct

    Student));

21. //给指针p分配了struct Student需要占用的字节大小

22. //相当于new了一个p

23. p->age = 99;

24. p->sid = 88;

25. return p;

26. }

27. void ShowStudent(struct Student * pst)

28. {

29. printf(“%d %d”, pst->age, pst->sid);

30. }