结构体的应用与理解.戴维营第九天

学了结构体,通过从最简单结构体输入到结构体数组,结构体指针,结构体作为函数参数,包含结构的结构,每种都进行敲代码来理解和体会,另外还学到了栈,先进后出,后进先出,堆需要自己分配,同时一定要有个明确的指针,否则自己都会找到不到,程序中的malloc, calloc, realloc等函数都是分配内存. 由小的空间向大的空间分配, 堆是从下向上分配.至于链表还在练习中

#include <stdio.h>

#include<string.h>
struct Student              /*学生结构*/
{
    char cName[20];             //姓名
    int iNumber;                //学好
    char cSex;                  //性别
    int iGrade;                 //年纪
}student;


int main()
{
    struct Student*pStruct;                                    //定义结构体指针
    pStruct=&student;                                           //指针指向结构体变量
    strcpy(pStruct->cName,"SuYuQuan");  //将字符串常亮复制到成员变量中
    pStruct->iNumber=12061212;              //为成员变量赋值
    pStruct->cSex='W';
    pStruct->iGrade=2;
    
    
    
    printf("----the student's information----\n");          //消息提示
    printf("Name:%s\n",student.cName);                      //使用变量直接输出
    printf("Number:%d\n",student.iNumber);
    printf("Sex:%c\n",student.cSex);
    printf("Grade:%d\n",student.iGrade);
    return 0;
    
}

 

struct Student{
    char cName[20];
    int iNumber;
    char cSex;
    int iGrade;
}student[5]={{"wangjiasheng",12062212,'M',3},
    {"yulongjiao",12062213,'W',3},
    {"zhangmeng",12062214,'W',3},
    {"jiangxuehuan",12062215,'w',3},
    {"hanliang",12062216,'M',3}};


int main()
{
    struct Student*pStruct;
    int index;
    pStruct=student;
    for (index=0; index<5; index++,pStruct++)
    {
        printf("NO%d student:\n",index+1);
        printf("Name:%s,Number:%d\n",(*pStruct).cName,pStruct->iNumber);
        printf("Sex:%c,Grade:%d\n",pStruct->cSex,pStruct->iGrade);
        printf("\n");
    }
    
    return  0;
}

 

struct Student
{
    char cName[20];
    float fScore[3];
}student={"suyuqun",98.5f,89.0,93.5f};



void Display(struct Student* stu)
{
    printf("------unformation------\n");
    printf("Name:%s\n",stu->cName);
    
    printf("English:%.2f\n",stu->fScore[2]);
    stu->fScore[2]=90.0f;
}



int main()
{
    struct Student* pStruct=&student;
    Display(pStruct);
    printf("change english:%.2f\n",pStruct->fScore[2]);
    return 0;
}

 

struct date
{
    int year;
    int month;
    int day;
};
struct student
{
    char name[30];
    int num;
    char sex;
    struct date birthday;
}student={"WangWei",12345678.,'M',{1986,12,6}};



int main()
{
    printf("-------information---------\n");
    printf("Name:%s\n",student.name);
    printf("Number:%d\n",student.num);
    printf("Sex:%c\n",student.sex);
    printf("Brithday:%d,%d,%d\n",student.birthday.year,
           student.birthday.month,
           student.birthday.day);
    return 0;
}