黑马程序员-c语言结构体,联合以及枚举

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struct book{    char title[20];    char author[15];    float value;};

    struct book threeKing ={      "sanguoyanyi","luoguanzhong",14.66    };    struct book hongLouMeng = { .value = 14.6 };    struct book boos[20];

结构体的基本定义和使用

struct author{    char name[20];    int sex;};struct newbook{    char title[20];    struct author name;    float value;};

    struct newbook myBook ={        "sanguosha",        {"luoguanzhong",1},        14.99    };    printf("%s is %s , $%f\n",myBook.title,myBook.name.name,myBook.value);            struct newbook *yourBook;    yourBook = &myBook;    printf("yourBook%s is %s , $%f\n",yourBook->title,yourBook->name.name,yourBook->value);    printf("yourBook%s is %s , $%f\n",(*yourBook).title,(*yourBook).name.name,(*yourBook).value);

嵌套结构体以及结构指针的使用，需要注意的是指针结构体使用了一种新符号->间接成员运算符

union hold{    int digit;    double bigf;    char letter;};

    union hold test = {88};    printf("%d\n",test.digit);

union hold{    struct newbook book;    struct book books;};

关于联合的思考，通常与结构体一起使用,但是感觉比较繁复

enum spectrum {red = 10,oragne,yellow,green,blue,violet};enum spectrum color;

        switch (color) {            case red:                printf("red %d",red);                break;            case blue:                printf("blue %d",blue);                break;            default:                break;        }

枚举通常与switch使用，也可以用作常量表示符使用，通常都是int类型，除非指定各单位值，不然都是递增

typedef int COLOR;COLOR green = 1;

typedef 关键字用来标示新的类型名

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