Basic knowledge of structure in C language

1 declaring the structure body

declares struct-body keyword struct struct body name {type modifier member name};
Declaring a student's structure

The first of these methods

struct student{
Char name[20]; Additional construction types can be used in struct members.
int number; Used between each member;
int age;
Float score;
};

typedef struct student student; The alias of the existing type modifier to Student

keyword typedef used to change aliases
The second method of
typedef struct teacher{
Char name[20];
char gender;
int age;
Char major[20];

}teacher;

The second most common

struct declarations are written on top of the main function or written in the. h file

2 use of structs (in the main function)

struct Teacher tea1 = {"Shenqingchang", ' m ', +, ' C '};
Struct member variable cannot output member information all with variable name
printf ("%s", tea1); incorrect output

Correct output

printf ("%s", tear1.name);

Modify member Names
int a = 0;
A = 10;
Change the first teacher's age to 15
Tear1.age = 15;
printf ("%d", tear1.age);
Modify the first teacher's name as "Dingchuyuan"
Tear1.name = "Dingchuyuan"; Wrong way to modify
strcpy (Tear1.name, "Dingchuyuan");
printf ("%s\n", tear1.name);
When modifying or exporting a struct, the member variable requires the struct name plus "." Add variable names to use

Example tear1.name = "Zhangsan" can be modified by writing

3 Structure Body Storage footprint
1 struct member variable, storage is from top to bottom, stored from first start
2 in memory, when the member variable is stored, the rule is: a multiple of the data type is stored, if it is occupied, the downward extension
3 Calculating the space of struct members, sum = The minimum multiple of the maximum number of bytes in a member variable
Application of 4 structure in function

Structs are used in functions that need to be written in the. h declaration file, and the other is not much different from the function

Example

A declares the structure body

#import <Foundation/Foundation.h>

Using declarative functions
typedef struct teacher{
Char name[20];
int age;
Float score;

}teacher;
Print all teacher Information
void Showinfoofteachers (Teacher array[],int count);

B implementation (definition) function

#import "Teacher.h"

Output All teacher information
void Showinfoofteachers (Teacher array[],int count) {
printf ("Teacher info: \ n");
for (int i = 0; i < count; i++) {
printf ("%-20s%-2d%.2f\n", Array[i].name,array[i].age,array[i].score);
}
}

The C call function is in the main function.

Teacher Tea[4] = {
{"Wangke", 25,90},
{"sunning", 40,89},
{"Xulaoshi", 50,78},
{"Wangcuiling", 35,91}

Showofteachers (tea, 4);

Basic knowledge of structure in C language