在C语言中，如何在头文件中声明的main函数中使用结构？

Question

In C, I need to declare a struct linked list in a header file. Within the main of my .c file, how do I declare a new instance of my struct? Also should I use typedef for my struct?

Answer 1

In your header:

struct mystruct
{
int a;
int b;
};

in .c file include ( #include "header.h" ) the header, then use in main:

struct mystruct obj1;
obj1.a=0;
obj1.b=0;

Answer 2

In your header file add the definition and typedef

typedef struct linked_list_node_st {
    int val;
    struct linked_list_node_st *next;
} Linked_List_Node;

In main.c, call the struct using the typedef.

#include <stdio.h>
#include <stdlib.h>
#include "structure.h"

int main(int argc, const char * argv[]) {
    Linked_List_Node *node;
    node = malloc(sizeof(Linked_List_Node));
    node->next = 0;
    node->val = 1;

    return 0;
}

Answer 3

U have struct in header, and want that struct in main.c? Just include it with #include "header.h" directive in your main.c, and start to use struct.

You use typedef when u want to make "your variable" in c , like:

typedef int INTEGER;
INTEGER number;

So u use typedef for closer indentify your struct, for you or for readers.