View Compilation Error

0_0_38675403_26032.cpp: In member function 'DataTime DataTime::get_pre_month()':
0_0_38675403_26032.cpp:37:58: error: expected primary-expression before ')' token
   37 |                 if((year%4==0&&year%100!=0)||year%400==0))a[2]=29;
      |                                                          ^