/in/foo.cc: In member function 'int Date::Day(int, int)':
/in/foo.cc:30:6: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
      else
      ^~~~
/in/foo.cc:31:15: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
       d = 28; break;
               ^~~~~
/in/foo.cc: In member function 'void Date::Add()':
/in/foo.cc:50:3: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized]
   while(day > Day(year, month) )
   ^~~~~