[C language-7] struct struct

A. Basic knowledge

An array of contrasts with arrays: constructed types can only have more than one data of the same type: struct types may consist of several different types of data consisting of 1. Defining types

1     struct Student2     {3         int age;4         char *name;5         float height;6     };

2. Define a struct variable define a variable in several ways a.

1     //define a struct variable2     struct Student stu = {, "Simon", 1.65f};

B.

1     struct Student {2         int age;3         char *name;4         float height;5     } stu = {, "Simon", 1.65f};

1/     * ERROR notation 2     struct Student p;3     p = {, "Tom"};4      */

C.

1     struct Student p;2     p.age = 17;3     p.name = "Tom";

D.

1     struct Student p2 = {, "Sam"};

E.

1     struct Student p3 = {. Name= "Judy",. Age= 44};

F. Anonymous

1     struct2     {3         int age;4         char *name;5     } stu3;

3. The struct is not allowed to define a recursive definition of the variable 4 within the struct construction code that defines the structure. can contain other structures

1 void Test1 () 2 {3     struct Date 4     {5         int year, 6         int month; 7         int day; 8     }; 9     St Ruct Student11     {         25 int age;13         struct Date birthday;14     };15     struct Student stu 1989, 8, 10}};17     printf ("My Birthday ==>%d-%d-%d\n", Stu.birthday.year, Stu.birthday.month, Stu.birthday.day); 19}

5. Structure array

1     struct Student2     {3         int age;4         char *name;5         float height;6     } stus[5];

Anonymous

1     struct2     {3         int age;4         char *name;5         float height;6     } stus[5];

6. As a function parameter, the struct is passed only the value of the member 7. Pointers to struct bodies

1 void Test4 () 2 {3     struct person p = {$, ' ss '}; 4     struct person *pointer; 5     6     pointer = &p; 7
   
    8     printf ("Test4:person ' s age =%d\n", p.age);//it's P!!!, not pointer!! 9     printf ("Test4:person's age =%d\n", (*pointer) (age)     , printf ("Test4:person's age =%d\n", pointer->age); 11}
   

==> 3 ways to access struct member variable A. Struct.vb. (*pointer). VC. Pointer->v 8. Structure in-vivo allocation a. Storage space is not allocated when defining a struct variable when allocating space, the allocated space size is a multiple of the maximum member variable 9. Structure replication

1     struct Student p2 = {, "Sam"};2     struct Student p3 = {. Name= "Judy",. age= 44};3     p3 = p2;4     printf ("p 3:age->%d, name-.%s\n ", P3.age, P3.name);

Out:p3:age->17, Name-> Sam

[C language-7] struct struct