NDK启航篇——C语言基础（联合体）

union MyValue{
  int y;
  int x;
  double z;
}；
void main(){
  union MyValue d1;
  d1.x = 90;
  d1.y = 100;
  d1.z = 99.9;//最后一个赋值的有效
 
  getchar();
}

enum Day{
  Monday,
  Tuesday,
  Wednesday
};
//不写默认相当于
enum Day{
  Monday = 0,
  Tuesday = 1,
  Wednesday = 2
};

void main (){
  //枚举的值必须是括号中的值
  enum Day d = Monday;
  printf("%#x,%d\n",&d,d);
 /* int i = 0;
  enum Day *p = &d;
  for(;i<3;i++){
   printf("%#x,%d\n",p,*p);
    p++;
}*/
  getchar();
}