C language structures must be known

Structural body

A struct is a special type that can be packaged with other types as a composite type. In the object-oriented concept, it is a special class.

Use several forms of structure:

First Kind

Define the struct body first, and then define the struct variable.

Define the structure body:

struct point1{    int x;    int y;};

Defining struct-Body variables

struct point1 point；

The second Kind

Define an anonymous struct, and then define struct-body variables

struct{    int x;    int y;}point2;

Third Kind

Define struct-body variables while defining structs

struct point3{    int x;    int y;}point;

Fourth type

Defining structs with typedef

typedefstruct point4{    int x;    int y;}t_point;

Then define the structure variables with T_point

point;

struct array

    struct student{        int age;        char *name;    };    struct student ss[10];

struct-Body pointer

    struct student *pst;    pst = &foo;

struct initialization

There are structural definitions

    struct student{        int age;        char *name;    };

First Kind

    struct student foo1 = {11"xiaoming"};    struct student foo2 = {11}

The second Kind

    struct student foo3 = {.age = 11};

Third Kind

    struct student foo4 = (struct student){11"xiaoming"};    struct student foo5 = (struct11};

struct array Initialization

    struct student ss1[10{0};    struct student ss2[10{{}{}{}};    struct student ss3[10{[2] = {}, [3{}};    struct student ss4[10{[2].age = 10, [3].name = "xiaoming"};

accessing struct members

Use the "." return struct member

    struct student foo = {11"xiaoming"};    int age = foo.age;    *name = foo.name;    printf("age is %d, name is %s\n", age, name);    20;    "liyong";    printf("age is %d, name is %s\n", foo.age, foo.name);

When using the struct pointer, you can use the arrow operator

    *pst;    pst = &foo;    printf("pst age is: %d and name is %s\n", (*pst).age, (*pst).name);    printf("pst age is: %d and name is %s\n", pst->age, pst->name);

C language structures must be known