foo.c: In function 'caculatedate':
foo.c:17:15: error: 'intdaysinmonth' undeclared (first use in this function); did you mean 'daysinmonth'?
   17 |         if(dd>intdaysinmonth[mm-1])
      |               ^~~~~~~~~~~~~~
      |               daysinmonth
foo.c:17:15: note: each undeclared identifier is reported only once for each function it appears in
foo.c:12:13: warning: variable 'daysinmonth' set but not used [-Wunused-but-set-variable]
   12 |         int daysinmonth[]={31,28,31,30,31,30,31,31,30,31,30,31};
      |             ^~~~~~~~~~~

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