foo.cc: In member function 'int Date::Monthday()':
foo.cc:72:17: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   72 |                 if (m == 2)
      |                 ^~
foo.cc:74:25: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   74 |                         return 31;}
      |                         ^~~~~~
foo.cc: In member function 'int DateTime::Sub(DateTime&)':
foo.cc:121:33: warning: 'delta' may be used uninitialized [-Wmaybe-uninitialized]
  121 |                 return delta1 + delta2;
      |                                 ^~~~~~
foo.cc:38:21: note: 'delta' was declared here
   38 |                 int delta;
      |                     ^~~~~