foo.cc: In function ‘int main()’:
foo.cc:10:30: warning: self-comparison always evaluates to false [-Wtautological-compare]
   10 |                 for (int m; m<m; m++)
      |                             ~^~
foo.cc:29:24: error: ‘m’ was not declared in this scope; did you mean ‘tm’?
   29 |                 for (; m > 0; m--)
      |                        ^
      |                        tm
foo.cc:48:21: error: ‘m’ was not declared in this scope; did you mean ‘tm’?
   48 |                 if (m == 1 || m == 3 || m == 5 || m == 7 || m == 8 || m == 10 || m == 12)
      |                     ^
      |                     tm