如何在C中的Struct变量中访问指针成员？

Question

I'm not new to C but I just found out a problem which I have to deal with. How do I access the member of a struct that is a pointer to another struct?

ex.

typdef struct {
   int points;
} tribute;

typedef struct {
    int year;
    tribute *victor;
} game;

int main(){
  tribute myVictor;
  myVictor.points = 10;  

  game myGame;
  myGame.year = 1994; // Runs fine
  myGame.victor = myVictor; // I want to point the victor member of the game struct to 
                            //myVictor object... But it gives me an error
} 

How could I correct this? I know that I should've made the myGame variable as a pointer.. but I'm asking if I can do this in a normal struct variable.

Answer 1

尝试：

myGame.victor = &myVictor;

Answer 2

This problem has nothing to do with structs as such. You are merely trying to copy a data variable into a pointer, which isn't valid. Instead of myGame.victor = myVictor; , let myGame.victor point to the address of myVictor.

myGame.victor = &myVictor;

Answer 3

If you want to point the victor member, you should pass the victor pointer (address, memory direction, ...).

So, it sould be:

myGame.victor = &myVictor;

Answer 4

typdef struct {
   int points;
} tribute;

typedef struct {
    int year;
    tribute *victor;
} game;

int main(){
  tribute myVictor;
  myVictor.points = 10;  

  game myGame;
  myGame.year = 1994; 
  myGame.victor = &myVictor; 
} 

here victor is a pointer to tribute so you need to provide address of myvictor So error in the last line of your code here is the correct one

changed to this in the last line : myGame.victor=&myVictor

Answer 5

victor of game struct is pointer. So you should assign the address of myVictor. Something like this:

myGame.victor = &myVictor;
printf("Points is: %d",myGame.victor->points);