View Compilation Error

0_0_33497127_347.cpp: In function 'int check(int, int, int)':
0_0_33497127_347.cpp:103:90: error: 'check_ord_day' was not declared in this scope
  if (year <= 0 || month <= 0 || month > 12 || day <= 0 || day > check_ord_day(month, year))
                                                                                          ^