预处理指令#define
1 #define MON 1 2 #define TUE 2 3 #define WED 3 4 #define THU 4 5 #define FRI 5 6 #define SAT 6 7 #define SUN 7
枚举类型的定义
方法一：
//枚举类型的定义 enum Day { MON = 1, TUE = 2, WED = 3, THU = 4, FRI = 5, SAT = 6, SUN = 7 } //变量声明 enum Day today;
方法2：
1 //枚举类型的定义 2 typedef enum day 3 { 4 MON = 1, 5 TUE = 2, 6 WED = 3, 7 THU = 4, 8 FRI = 5, 9 SAT = 6, 10 SUN = 7 11 } 12 13 //变量声明 14 day today;