foo.cc: In function 'int total(int, int, int)':
foo.cc:25:14: warning: statement has no effect [-Wunused-value]
   25 |         for (month1; month1 <= month; month1++)
      |              ^~~~~~
foo.cc: In function 'int year(int, int, int, int)':
foo.cc:55:14: warning: statement has no effect [-Wunused-value]
   55 |         for (year1; year1 < year2; year1++)
      |              ^~~~~
foo.cc: In function 'int main()':
foo.cc:68:13: warning: unused variable 'runyue' [-Wunused-variable]
   68 |         int runyue = 0;
      |             ^~~~~~

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