无法访问struct的struct数组中的成员变量

Question

I am making a C program, which needs to access a struct array in a struct.

The definition looks like below

struct def_world
{
    bool lock;
    char tilemap;
    def_tile tile[100][100];
struct def_tile
{
    bool lock;
    char kind;
    def_obj * obj;
    void * evt;
};
struct def_obj
{
    bool lock;
    int indexOfTable;
    bool frozen;
    char x,y;
    char kind;
    char face;
    char * msg;
    char * ip;
};

in the main function, I want to access world's tile[3][3] 's obj's face.

I initialize world as

def_world world={0,};

but the following lines make errors

world.tile[3][3].obj=newobj();//newobj() returns def_obj type

world.tile[3][3].obj->face;

any idea how to access obj's face?

Answer 1

Try these lines instead:

 
 
 
  
  world.tile[3][3]->obj=newobj();//newobj() returns def_obj type world.tile[3][3]->obj.face;
 
  

Explanation:
world.tile[3][3] is a def_tile . It's obj field isn't def_obj , but rather def_obj* . Therefore, to get the def_obj that it points to, you should use ->obj .
Inside def_obj , face is just a char, so you would access it with .face .