【C】枚举用例分析

枚举，一种构造类型，用于声明一组命名的常数，当一个变量有几种可能的取值时，可以将它定义为枚举类型。

枚举的目的就是提高程序的可读性；

枚举的特殊属性:

初始化一个枚举类型：

enum day {Sun=0,Mon,Tue,Wed,Thu,Fri,Sat};

定义Sun为0，后面的Mon Tue Wed 就为1 2 3

enum day {Sun,Mon=10,Tue,Wed,Thu,Fri,Sat};

此时Sun为0 Mon=10 Tue=11 Wed=12·······

 

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
enum day {Sun=0,Mon,Tue,Wed,Thu,Fri,Sat};
const char * dds[] = {"Sun","Mon","Tue","Wed","Thu","Fri","Sat"};
int main(void)
{
    enum day dd,yy;
    char days[5];
    printf("please input one day:\n");
    fgets(days,4,stdin);
        for(dd=Sun; dd<=Sat; dd++)
        {
            if(strcmp(days,dds[dd])==0)　　//比较字符串
            {
                break;
            }
        }
        switch(dd)
        {
            case Sun:printf("tomorrow is mon\n"); break;
            case Mon:printf("tomorrow is tue\n"); break;
            case Tue:printf("tomorrow is wed\n"); break;
            case Wed:printf("tomorrow is thu\n"); break;
            case Thu:printf("tomorrow is fri\n"); break;
            case Fri:printf("tomorrow is sat\n"); break;
            case Sat:printf("tomorrow is sun\n"); break;
        }
    
}