结构体与结构体指针数组

1.结构体定义与使用。

// 结构体的定义
struct Student {
    char *name;
    int age;
};

//结构体定义对象别名
struct Student1 {
    char *name;
    int age;
} student1;


int main() {
    //结构体赋值使用
    //  struct Student student = {"老五", 20};
    struct Student student;
    student.name = "钻石王老五";
    student.age = 12;
    printf("Student的name:%s, age:%d\n", student.name, student.age);

    //结构体别名
    student1.name = "黑豹老六";
    student1.age = 88;
    printf("student1的name:%s, age:%d\n", student1.name, student1.age);

    return 0;
}

2.结构体指针 与 动态内存开辟。

// 结构体的定义
struct Student {
    char *name;
    int age;
};
int main() {
    //定义结构体指针 动态开辟内存
    struct Student *structStudent = malloc(sizeof(struct Student));
    structStudent->name = "大刀豆子";
    structStudent->age = 99;
    printf("structStudent的name:%s, age:%d\n", structStudent->name, structStudent->age);
    free(structStudent);
    structStudent = NULL;
    return 0;
}

3.结构体的数组。

// 结构体的定义
struct Student {
    char *name;
    int age;
};

//结构体数组
int main() {

    //静态开辟
    struct Student student[10];
    student->name = "美男子";
    student->age = 100;
    (student + 1)->name = "花少女";
    (student + 1)->age = 99;
//    student[1].name = "花少女";
//    student[1].age = 99;
    printf("Student[0]的name:%s, age:%d\n", student->name, student->age);
    printf("Student[1]的name:%s, age:%d\n", student[1].name, student[1].age);

    //结构体数据动态开辟
    struct Student *student2 = malloc(3 * sizeof(struct Student));
    student2->name = "美男子";
    student2->age = 100;
    (student2 + 2)->name = "花少女";
    (student2 + 2)->age = 99;
    printf("Student2[0]的name:%s, age:%d\n", student2->name, student2->age);
    printf("Student2[2]的name:%s, age:%d\n", (student2 + 2)->name, (student2 + 2)->age);

    free(student2);
    student2 = NULL;
    return 0;
}

4.结构体与结构体指针 取别名。

// 结构体的定义
struct Student {
    char *name;
    int age;
};


//结构体别名
typedef struct Student _Student;
//结构体指针别名
typedef struct Student *__Student;

//定义结构体并同时取别名
typedef struct {
    char *name;
    int age;
} Stu;
int main() {
    _Student student;
    student.name = "张三";
    student.age = 10;
    printf("student的name:%s, age:%d\n", student.name, student.age);

    __Student student2 = malloc(sizeof(__Student));
    student2->name = "李四";
    student2->age = 20;
    printf("student2的name:%s, age:%d\n", student2->name, student2->age);
    free(student2);
    student2=NULL;

    Stu *stu = malloc(sizeof(Stu));
    stu->name = "王五";
    stu->age = 12;
    printf("stu的name:%s, age:%d\n", stu->name, stu->age);
    free(stu);
    stu = NULL;

    return 0;
}

5.枚举。

//枚举定义
enum Type {
    One, Two
};
//枚举的定义并取别名
typedef enum {
    Three, Four
} Type1;

int main() {
    enum Type type = Two;
    Type1 type1 = Three;
    printf("type的值:%d\n", type);
    printf("type1的值:%d\n", type1);
    return 0;
}