Linux C language: structure

1. declared and defined structure

Structure: collection of different types of variable data;

First definition method (most commonly used):

#include<stdio.h>
struct weapon{
	char name[20];
	int atk;
	int price;
};//一定别忘了这个冒号；
int main{
	struct weapon weapon_1={"weapon_name",100,200};
	return 0;
}

The second is defined by:

#include<stdio.h>
struct weapon{
	char name[20];
	int atk;
	int price;
}weapon_1; //相当于定义了一个全局变量，变量的类型是struct weapon，变量的名称是weapon_1；
int main{
	return 0；
}

This structure is not clearly written, is not conducive to the maintenance program;

The third-defined method:

struct{
	char name[20];
	int atk;
	int price;
}waapon_1;

Such writing can not be defined other structure variable name;

2. Initialization structure and references

Initialization and cited general structure:

struct weapon weapon_1={"weapon_name",100,200};
printf("%s\n%d\n",weapon_1.name,++weapon_1.price);

Initialize an array of structures and references:

struct weapon weapon_2[2]={{"weapon_name1",100,50},{"weapon_name2",100,200}};//里面的花括号也可以不加；
printf("%s\n%d\n",weapon_2[0].name,weapon_2[1].atk);

3. The structure pointer

Structure variable pointer:

struct weapon* w;
w=&weapon_1;
printf("name =%s\nname =%s\n",(*w).name,w->name);//same result;

Structure pointer array variables:

struct weapon* p;
p = weapon_2;
printf("%s\n",p->name);

p++;// equal weapon_2 +1 指向weapon_2[1];
printf("%s\n",p->name);