枚举的使用和注意事项

enum Season {
  Spring,//0
  Summer=2,//2
  Autumn,//3
  Winter//4
};

enum Season {
  Spring,//0
  Summer=2,//2
  Autumn,//3
  Winter=100//100
};

enum Season {
  Spring=1,//1
  Summer,//2
  Autumn=6,//6
  Winter//7
};

#include<iostream>
#include<string>
using namespace std;
//常用第一种方式
//第一种方式:
enum Season {
  Spring,//0
  Summer,//1
  Autumn,//2
  Winter//3
};
/*
//第二种方式:
enum Season {
  Spring,//0
  Summer,//1
  Autumn,//2
  Winter//3
}s;
*/
/*
//第三种方式:
enum {
  Spring,//0
  Summer,//1
  Autumn,//2
  Winter//3
}s1,s2;
*/
int main(void) {
  enum Season s;
  s = Spring;
  //s=0;不可把整数直接赋值给枚举变量
  //s = (enum Season)3;//强制类型转换可能存在风险
  enum Season s2;
  s2 = Winter;
  printf("s= %d\n", s);//0
  printf("s2=%d\n", s2);//3
    printf("enum Season:%d", sizeof(enum Season));//4
  system("pause");
  return 0;
}