欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

第 14 章 结构和其他数据形式(enum枚举)

程序员文章站 2022-03-31 12:40:09
1 /* 2 enum.c -- 使用枚举类型的值 3 */ 4 5 #include 6 #include 7 //#include //C99特性 8 9 #define LEN 30 10 11 char* s_gets(cha ......
第 14 章 结构和其他数据形式(enum枚举)
 1 /*-----------------------------
 2     enum.c -- 使用枚举类型的值
 3 -----------------------------*/
 4 
 5 #include <stdio.h>
 6 #include <string.h>
 7 //#include <stdbool.h>    //C99特性
 8 
 9 #define LEN 30
10 
11 char* s_gets(char *st, int n);
12 
13 enum spectrum {red, orange, yellow, green, blue, violet};
14 const char *colors[] = {"red", "orange", "yellow", "green", "blue", "violet"};
15 
16 int main()
17 {
18     char choice[LEN];
19     int color;
20     bool color_is_found = false;
21 
22     puts("Enter a color (empty line to quit):");
23 
24     while (s_gets(choice, LEN) != NULL && choice[0] != '\0')
25     {
26         for (color = red; color != violet; ++color)
27         {
28             if (strcmp(choice, colors[color]) == 0)
29             {
30                 color_is_found = true;
31                 break;
32             }
33         }
34 
35         if (color_is_found)
36             switch (color)
37             {
38             case red:
39                 puts("Roses are red.");
40                 break;
41             case orange:
42                 puts("Poppies are orange.");
43                 break;
44             case yellow:
45                 puts("Sunflowers are yellow.");
46                 break;
47             case green:
48                 puts("Grass is green");
49                 break;
50             case blue:
51                 puts("Bluebells are blue");
52                 break;
53             case violet:
54                 puts("Violets are violet");
55                 break;
56             }
57         else
58             printf("I don't know about the color %s.\n", choice);
59 
60         color_is_found = false;
61         
62         puts("Next color, please (empty line to quit):");
63     }
64 
65     puts("Goodbye");
66 
67     return 0;
68 }
69 
70 char* s_gets(char *st, int n)
71 {
72     char *ret_val, *find;
73 
74     if (ret_val = fgets(st, n, stdin))
75     {
76         if (find = strchr(st, '\n'))
77             *find = '\0';
78         else
79             while (fgetc(stdin) != '\n') continue;
80     }
81 
82     return ret_val;
83 }
enum.c

第 14 章 结构和其他数据形式(enum枚举)