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] != ' ') 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. ", 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, ' ')) 77 *find = ' '; 78 else 79 while (fgetc(stdin) != ' ') continue; 80 } 81 82 return ret_val; 83 }
