enum的用法

作者：追风剑情 发布于：2020-3-13 13:29 分类：C

示例 


  1. #define _CRT_SECURE_NO_WARNINGS
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4. #include <stdbool.h> //C99特性
  5. #include <string.h>
  6.  
  7. char* s_gets(char* st, int n);
  8.  
  9. enum spectrum {red, orange, yellow, green, blue, violet};
  10. const char* colors[] = {"red", "orange", "yellow", "green", "blue","violet"};
  11. #define LEN 30
  12.  
  13. /* C允许同名，C++不允许. 例如下面代码：*/
  14. struct rect { double x; double y; };
  15. int rect;
  16.  
  17. int main(int argc, char* argv[])
  18. {
  19. 	char choice[LEN];
  20. 	enum spectrum color;
  21. 	bool color_is_found = false;
  22.  
  23. 	puts("Enter a color (empty line to quit)：");
  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. 		{
  37. 			switch (color)
  38. 			{
  39. 			case red:
  40. 				puts("Roses are red.");
  41. 				break;
  42. 			case orange:
  43. 				puts("Poppies are orange.");
  44. 				break;
  45. 			case yellow:
  46. 				puts("Sunflowers are yellow.");
  47. 				break;
  48. 			case green:
  49. 				puts("Grass are green.");
  50. 				break;
  51. 			case blue:
  52. 				puts("Bluebells are blue.");
  53. 				break;
  54. 			case violet:
  55. 				puts("Violets are violet.");
  56. 				break;
  57. 			default:
  58. 				break;
  59. 			}
  60. 		}
  61. 		else
  62. 		{
  63. 			printf("I don't know about the color %s.\n", choice);
  64. 		}
  65. 		color_is_found = false;
  66. 		puts("Next color, please (empty line to quit):");
  67. 	}
  68. 	puts("Goodbye!");
  69.  
  70. 	system("pause");
  71. 	return 0;
  72. }
  73.  
  74.  
  75. // 自己实现读取函数
  76. char* s_gets(char* st, int n)
  77. {
  78. 	char* ret_val;
  79. 	int i = 0;
  80. 	ret_val = fgets(st, n, stdin);
  81. 	if (ret_val) //即，ret_val != NULL
  82. 	{
  83. 		while (st[i] != '\n' && st[i] != '\0')
  84. 			i++;
  85. 		if (st[i] == '\n')
  86. 			st[i] = '\0';
  87. 		else
  88. 			while (getchar() != '\n')
  89. 				continue;
  90. 	}
  91. 	return ret_val;
  92. }


运行测试

1111.png

标签: C语言

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