C language pointer to struct variable

A pointer to a variable represents the starting position in memory

A pointer to a variable in the struct represents the starting position of the struct variable in memory, and it can also point to an array of struct variables

　

To define a pointer to a struct-body variable:

// Suppose you already have a struct named student struct Student *pstruct//  struct type * pointer name;

There are three ways to refer to members in a struct by pointers

Demo

1# include <stdio.h>2# include <stdlib.h>3 /*4 1. Referencing struct members using5  6  7  */8 9 Ten intMain () One { A  -     structStudent -     { the         Charcname[ -]; -         intInumber; -         CharCsex; -         intIgrade; +}student={"Girl", .,'W',2}; -  +     structStudent *pstruct; APstruct = &student;//point to student struct variable atprintf"-----------The sudent ' s information----------\ n"); -printf"name:%s\n",(*pstruct). CName); -printf"number:%d\n",(*pstruct). Inumber); -printf"sex:%c\n",(*pstruct). Csex); -printf"grade:%d\n",(*pstruct). Igrade); -printf"============ reference struct members using the-so symbol ==============\n"); inprintf"name:%s\n",pstruct->cName); -printf"number:%d\n",pstruct->inumber); toprintf"sex:%c\n",pstruct->csex); +printf"igrade:%d\n",pstruct->igrade); -      the     return 0; *}

1.student.inumber

2. (*pstruct). Inumber

3.pstruct->inumber

The latter two are members of struct variables that are referenced by struct variable pointers, and the 2nd is the reason for the addition of parentheses on *pstruct because the operation priority of the "*pstruct" is to be elevated, because in the default case. The precedence of an operator is higher than the precedence of the * operator.

Personal preferred to refer to a member in a struct by using the point to operator

Note: The position of the declared struct can be placed outside the main function, or it can be placed in the main function

Some examples of exercises:

1# include <stdlib.h>2# include <string.h>3 4 structStudent5 {6     Charname[ -];7     intInumber;8     CharCsex;9     intIgrade;Ten }student; One  A intMain () - { -     structStudent *pstruct; thePstruct = &student; -strcpy (Pstruct->name,"Yao Yao"); -Pstruct->inumber = .; -pstruct->csex='W'; +Pstruct->igrade= the; -      +printf"------------The student ' s information---------\ n"); Aprintf"name:%s\n",(*pstruct). Name); atprintf"number:%d\n",(*pstruct). Inumber); -printf"sex:%c\n",(*pstruct). Csex); -printf"grade:%d\n",(*pstruct). Igrade); -  -      -     return 0; in}

1# include <stdio.h>2# include <stdlib.h>3 4 5 //Create a student body structure6 structStudent7 {8     Charname[ -];9     Charsex;Ten     intscore; One     Charlovep[ -]; A }student; -  -  the  - intMain () -  - { +     structStudent *pstruct; -Pstruct = &student; +printf"input:====================\n"); Aprintf"Name:"); atscanf"%s",&pstruct->Name); -GetChar ();//a getchar is required to accept the space symbol when reading the string using%s so that the next input is not affected -printf"Sex:"); -scanf"%c",&pstruct->sex); -printf"Score:"); -scanf"%d",&pstruct->score); inprintf"Love People:"); -scanf"%s",&pstruct->LOVEP); toprintf"print:====================\n"); +printf"name:%s\nsex:%c\nscore:%d\nlovepeople:%s\n",pstruct->name,pstruct->sex,pstruct->score,pstruct->LOVEP); -  the     return 0; *}

Because it is relatively simple, so there is no comment, there are 1 points in the practice,

1. Master the two ways to manipulate structural variables with pointers

C language pointer to struct variable