1、结构体的3种定义方式
定义结构体类型后定义结构体变量//定义结构体类型struct struct_1{　　char *name;　　int age;};　　//结构体大括号外加;每项后加;        //定义结构体变量struct struct_1 str_1 = {"jiao", 26};str_1.name = "fftu";        //修改函数体中的属性printf("%s--%d", str_1.name, str_1.age);*结构体实例化后不能重新整体赋值，只能调用属性赋值
定义结构体类型的同时定义结构体变量struct struct_2{　　char *name;　　int age;} stu_2 = {"heinrich", 88};struct struct_2 stu_3 = {"jiao", 90};直接定义结构体变量struct{　　char *name;　　int age;} stu_2 = {"heinrich", 88};2、结构体中包含结构体struct info{　　char *ps;　　char *date;};    struct man{　　char *name;　　int age;　　struct info mans_info;};    struct info info_1 = {　　"ps_1",　　"2017.4.1"};    struct man man_1 = {"fftu", 26, info_1};printf("%s\n%d\n%s\n%s\n", man_1.name, man_1.age, man_1.mans_info.ps, man_1.mans_info.date);        3、结构体数组struct struct_1{　　char *name;　　int age;};        struct struct_1 str[2] = {　　{"fftu", 99},　　{"jiao", 26}};    printf("%s\n%d", str[1].name, str[1].age);4、结构体作为参数传递struct struct_1{    char *name;    int age;};void fun_1(struct struct_1 str){    //struct struct_1相当于类型，比如int    str.name = "heinrich";    str.age = 999;}struct struct_1 str_1 = {"jiao", 256};    fun_1(str_1);    //传递的是值，原结构体变量不会被修改printf("%s\n%d", str_1.name, str_1.age);5、结构体指针struct struct_1{    char *name;    int age;};void fun_1(struct struct_1 *str){    str->name = "heinrich";    //通过地址访问变量，不做取值运算    str->age = 999;}struct struct_1 str_1 = {"jiao", 256};struct struct_1 *p = &str_1;fun_1(p);printf("%s\n%d", str_1.name, str_1.age);