/in/foo.cc: In function 'int main()':
/in/foo.cc:9:11: error: the value of 'a' is not usable in a constant expression
   case a==0 : cout<<"Sunday";
           ^
/in/foo.cc:5:6: note: 'int a' is not const
  int a;
      ^
/in/foo.cc:9:11: error: the value of 'a' is not usable in a constant expression
   case a==0 : cout<<"Sunday";
           ^
/in/foo.cc:5:6: note: 'int a' is not const
  int a;
      ^
/in/foo.cc:10:11: error: the value of 'a' is not usable in a constant expression
   case a==1 : cout<<"Monday";
           ^
/in/foo.cc:5:6: note: 'int a' is not const
  int a;
      ^
/in/foo.cc:10:11: error: the value of 'a' is not usable in a constant expression
   case a==1 : cout<<"Monday";
           ^
/in/foo.cc:5:6: note: 'int a' is not const
  int a;
      ^
/in/foo.cc:11:11: error: the value of 'a' is not usable in a constant expression
   case a==2 : cout<<"Tuesday";
           ^
/in/foo.cc:5:6: note: 'int a' is not const
  int a;
      ^
/in/foo.cc:11:11: error: the value of 'a' is not usable in a constant expression
   case a==2 : cout<<"Tuesday";
           ^
/in/foo.cc:5:6: note: 'int a' is not const
  int a;
      ^
/in/foo.cc:12:11: error: the value of 'a' is not usable in a constant expression
   case a==3 : cout<<"Wednesday";
           ^
/in/foo.cc:5:6: note: 'int a' is not const
  int a;
      ^
/in/foo.cc:12:11: error: the value of 'a' is not usable in a constant expression
   case a==3 : cout<<"Wednesday";
           ^
/in/foo.cc:5:6: note: 'int a' is not const
  int a;
      ^
/in/foo.cc:13:11: error: the value of 'a' is not usable in a constant expression
   case a==4 : cout<<"Thursday";
           ^
/in/foo.cc:5:6: note: 'int a' is not const
  int a;
      ^
/in/foo.cc:13:11: error: the value of 'a' is not usable in a constant expression
   case a==4 : cout<<"Thursday";
           ^
/in/foo.cc:5:6: note: 'int a' is not const
  int a;
      ^
/in/foo.cc:14:11: error: the value of 'a' is not usable in a constant expression
   case a==5 : cout<<"Friday";
           ^
/in/foo.cc:5:6: note: 'int a' is not const
  int a;
      ^
/in/foo.cc:14:11: error: the value of 'a' is not usable in a constant expression
   case a==5 : cout<<"Friday";
           ^
/in/foo.cc:5:6: note: 'int a' is not const
  int a;
      ^
/in/foo.cc:15:11: error: the value of 'a' is not usable in a constant expression
   case a==6 : cout<<"Sunday";
           ^
/in/foo.cc:5:6: note: 'int a' is not const
  int a;
      ^
/in/foo.cc:15:11: error: the value of 'a' is not usable in a constant expression
   case a==6 : cout<<"Sunday";
           ^
/in/foo.cc:5:6: note: 'int a' is not const
  int a;
      ^
/in/foo.cc:18:1: error: expected '}' at end of input
 }
 ^