Create Date class to perform error checking on the initializer values for data members month, day and year. - C++ Class

C++ examples for Class:Class Creation

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Description

Create Date class to perform error checking on the initializer values for data members month, day and year.

Demo Code

                                                                                                                                               
#include <iostream>
                                                                                                                                                  
#include <stdexcept>
class Date {//  ww  w .  j ava2s. c  om
public:
  explicit Date(unsigned int = 1, unsigned int = 1, unsigned int = 2000);
                                                                                                                                                  
  void nextDay();  // increment date by 1
                                                                                                                                                  
  void print();
                                                                                                                                                  
  friend std::ostream& operator<<(std::ostream& out, Date& d) {
    return d.printSensible(out);
  }
                                                                                                                                                  
private:
  static const size_t MONTHS_IN_YEAR = 12;
  static const size_t NO_LEAP = 28;
  static const size_t LEAP = 29;
                                                                                                                                                  
  unsigned int DAYS_IN_MONTH[MONTHS_IN_YEAR + 1] = { 0,  31, NO_LEAP, 31, 30, 31, 30,
    31, 31, 30,      31, 30, 31 };
                                                                                                                                                  
  unsigned int month;
  unsigned int day;
  unsigned int year;
                                                                                                                                                  
  bool isLeapYear(unsigned int);
                                                                                                                                                  
  std::ostream& printSensible(std::ostream&);
};
                                                                                                                                                  
                                                                                                                                                  
Date::Date(unsigned int m, unsigned int d, unsigned int y) {
  if (y > 0) {
    year = y;
  }
  else {
    throw std::invalid_argument("Year must be a positive number");
  }
  if (m > 0 && m <= 12) {
    month = m;
  }
  else {
    throw std::invalid_argument("Month must be 1-12");
  }
                                                                                                                                                  
  DAYS_IN_MONTH[2] = (isLeapYear(year) ? LEAP : NO_LEAP);
                                                                                                                                                  
  if (d > 0 && d <= DAYS_IN_MONTH[month]) {
    day = d;
  }
  else {
    throw std::invalid_argument("Day must be 0-31");
  }
}
// increment date by 1
void Date::nextDay() {
  if (day < DAYS_IN_MONTH[month]) {
    day++;
  }
  else {
    day = 1;
    if (month < MONTHS_IN_YEAR) {
      month++;
    }
    else {
      month = 1;
      year++;
                                                                                                                                                  
      DAYS_IN_MONTH[2] = (isLeapYear(year) ? LEAP : NO_LEAP);
    }
  }
}
// check whether given year is leap year
bool Date::isLeapYear(unsigned int y) {
  return (y % 4 == 0 || y % 400 == 0 || y % 100 == 0);
}
// print date in format mm/dd/yyyy
                                                                                                                                                  
void Date::print() {
  std::cout << month << "/" << day << "/" << year;
}
std::ostream& Date::printSensible(std::ostream& out) {
  return out << day << "/" << month << "/" << year;
}
                                                                                                                                                  
#include <iostream>
                                                                                                                                                  
int main(int argc, const char *argv[]) {
  Date d1(11, 30, 2015);
                                                                                                                                                  
  for (int i = 0; i < 365; ++i) {
    d1.nextDay();
                                                                                                                                                  
    std::cout << d1 << std::endl;
  }
  return 0;
}

Result


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