C/C++ 嵌套结构体动态内存管理实现

cozhzh2002

结构体嵌套多层结构体指针怎么分配内存？

struct
{
int a1;
int a2[100];
}A;

struct
{
int B1;
int countA;
struct A *a;
}B;

struct
{
int c1;
struct A a;
int countB;
struct B *b;
}C;

函数要返回结构体C的内容，如果给结构体C分配内存？

csccyab

1. #include <stdio.h>
   
2. 
   
3. struct A
   
4. {
   
5. int a1;
   
6. int a2[100];
   
7. };
   
8. 
   
9. struct B
   
10. {
    
11. int B1;
    
12. int countA;
    
13. struct A *a;
    
14. };
    
15. 
    
16. struct C
    
17. {
    
18. int c1;
    
19. struct A a;
    
20. int countB;
    
21. struct B *b;
    
22. };
    
23. 
    
24. 
    
25. void print_C_struct_member_values(struct C *c){
    
26. 
    
27.    printf("c_obj.a struct values are: %d, %d\n", c->a.a1, c->a.a2[0]);
    
28.    printf("c_obj.b struct values are: %d, %d\n", c->b->B1, c->b->countA);
    
29.    printf("c_obj struct values aree %d, %d\n", c->c1, c->countB);
    
30. 
    
31. }
    
32. 
    
33. 
    
34. int main() {
    
35.    struct B b_obj;
    
36.    struct C c_obj;
    
37.    c_obj.b = &b_obj;
    
38.    b_obj.a = &(c_obj.a);
    
39. 
    
40.    b_obj.a->a1 = 10;
    
41.    b_obj.a->a2[0] = 1;
    
42.    b_obj.B1 = 2;
    
43.    b_obj.countA = 3;
    
44.    c_obj.c1 = 4;
    
45.    c_obj.countB = 5;
    
46. 
    
47.    print_C_struct_member_values(&c_obj);
    
48. }
    

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