// reference_type_function_arguments.cppstruct Date{short DayOfWeek;short Month;short Day;short Year;};// Create a Julian date of the form DDDYYYY// from a Gregorian date.long JulianFromGregorian( Date& GDate ){static int cDaysInMonth[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31  };long JDate = 0;// Add in days for months already elapsed.for ( int i = 0; i < GDate.Month - 1; ++i )JDate += cDaysInMonth[i];// Add in days for this month.JDate += GDate.Day;// Check for leap year.if ( GDate.Year % 100 != 0 && GDate.Year % 4 == 0 )JDate++;// Add in year.JDate *= 10000;JDate += GDate.Year;return JDate;}int main(){}