枚举用法实例

原先C语言中枚举用的不多，现在整理一篇，方便以后自己复习：

函数功能是在定义的颜色数组中查找是否有从键盘中输入的颜色，如果有则打印响应的字符串，否则打印未找到的信息，并提示是否重新输入。

/*使用枚举值*/#include <stdio.h>#include <string.h>#include <stdbool.h>enum spectrum {red, orange, yellow, green, blue, violet};//声明枚举const char *colors[] = {"red","orange","yellow", "green", "blue", "violet"};//字符串数组#define LEN 30int main(void){char choice [LEN];enum spectrum color;bool color_is_found = false;puts("Enter a color (empty line to quit):");while (gets(choice) != NULL && choice[0] != '\0')//while循环，与puts("Next color, please (empty line to quit):");配合实现循环输入的功能{for (color = red; color <= violet; color++)//在数组中寻找是否有想要查询的颜色{if (strcmp(choice , colors[color]) == 0){color_is_found = true;break;}}if (color_is_found)//当color_is_found标志为1时，打印响应的字符串switch (color)//choice 是字符串，switch接受的是数值的类型，所以此处使用的是color值。{case red: puts("Roses are red.");        break;case orange: puts("Poppies are orange.");break;case yellow: puts("Sunflowers are yellow.");break;case green: puts("Grass are green.");break;case blue: puts("Bluebells are blue.");break;case violet: puts("Violets are violet.")break;}elseprintf ("I don't know about the color %s.\n",choice);color_is_found = false;puts("Next color, please (empty line to quit):");}puts("Bye!");return 0;//返回值}

简单的总结：

枚举类型其实是用字符代表数字，方便记忆和使用，其实质还是数值。也就是说可以把它理解为助记符。