public boolean doesMonthHave30Days(int month)

Given a number in the range 1-12 that represents a month in the year (1=Jan, 2=Feb, etc), return true if the month has 30 days, false otherwise. The 4 months with 30 days are April, June, September and November.

  boolean has30Days = false; // default
  if (month == 4 || month == 6 || month == 9 || month == 11) {
    has30Days = true;
  }
  return has30Days;