foo.c: In function 'caculatedate':
foo.c:12:9: error: 'intdaysinmonth' undeclared (first use in this function)
   12 |         intdaysinmonth[]={31,28,31,30,31,30,31,31,30,31,30,31};
      |         ^~~~~~~~~~~~~~
foo.c:12:9: note: each undeclared identifier is reported only once for each function it appears in
foo.c:12:24: error: expected expression before ']' token
   12 |         intdaysinmonth[]={31,28,31,30,31,30,31,31,30,31,30,31};
      |                        ^

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