foo.cc: In function ‘int main()’:
foo.cc:19:17: error: ‘t’ was not declared in this scope
   19 |     while (d <= t)
      |                 ^
foo.cc:25:13: error: ‘c’ was not declared in this scope; did you mean ‘cd’?
   25 |             c = 1;
      |             ^
      |             cd
foo.cc:27:13: error: ‘c’ was not declared in this scope; did you mean ‘cd’?
   27 |             c++;
      |             ^
      |             cd
foo.cc:31:9: error: ‘c’ was not declared in this scope; did you mean ‘cd’?
   31 |     if (c != 1) {
      |         ^
      |         cd
foo.cc:13:9: warning: unused variable ‘total_days’ [-Wunused-variable]
   13 |     int total_days = days_in_month[m];
      |         ^~~~~~~~~~