C++ Object-Oriented Programming: Date validation and management

C++ Object oriented programming: Exercise-8 with Solution

Write a C++ program to implement a class called Date that has private member variables for day, month, and year. Include member functions to set and get these variables, as well as to validate if the date is valid.

Sample Solution:

C Code:

#include <iostream> // Include necessary header for input/output stream

class Date { // Define a class named Date
  private: 
    int day; // Private member variable to store the day
    int month; // Private member variable to store the month
    int year; // Private member variable to store the year

  public:
    // Constructor to initialize Date object with provided day, month, and year
    Date(int d, int m, int y): day(d), month(m), year(y) {}

    // Member function to set the date
    void setDate(int d, int m, int y) {
      day = d; // Set day
      month = m; // Set month
      year = y; // Set year
    }

    // Member function to get the day
    int getDay() const {
      return day; // Return day
    }

    // Member function to get the month
    int getMonth() const {
      return month; // Return month
    }

    // Member function to get the year
    int getYear() const {
      return year; // Return year
    }

    // Member function to validate if the date is valid
    bool isValidDate() const {
      // Check if the month is valid
      if (month < 1 || month > 12)
        return false;

      // Check if the day is valid
      if (day < 1 || day > 31)
        return false;

      // Check for specific month-day combinations that are invalid
      if ((month == 4 || month == 6 || month == 9 || month == 11) && day > 30)
        return false;

      if (month == 2) {
        // Check for leap year
        if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)) {
          if (day > 29)
            return false;
        } else {
          if (day > 28)
            return false;
        }
      }

      // Date is valid
      return true;
    }
};

int main() {
  // Create a date object
  Date date(0, 0, 0); // Initialize Date object with default values

  // Set the date
  int day, month, year; // Define variables to store day, month, and year
  std::cout << "Input day: "; // Prompt user to input day
  std::cin >> day; // Input for day
  std::cout << "Input month: "; // Prompt user to input month
  std::cin >> month; // Input for month
  std::cout << "Input year: "; // Prompt user to input year
  std::cin >> year; // Input for year

  date.setDate(day, month, year); // Set Date object with provided values

  // Get and display the date
  std::cout << "Date: " << date.getDay() << "/" << date.getMonth() << "/" << date.getYear() << std::endl; // Output date

  // Validate the date
  if (date.isValidDate())
    std::cout << "The date is valid." << std::endl; // Output for a valid date
  else
    std::cout << "The date is invalid." << std::endl; // Output for an invalid date

  return 0; // Return 0 to indicate successful completion
}

Sample Output:

 Input day: 01
Input month: 01
Input year: 2000
Date: 1/1/2000
The date is valid.

Input day: 29
Input month: 02
Input year: 2017
Date: 29/2/2017
The date is invalid.

Input day: 31
Input month: 6
Input year: 2019
Date: 31/6/2019
The date is invalid.

Explanation:

In the above exercise,

• The Date class is defined with private member variables day, month, and year representing the day, month, and year of the date.
• The constructor Date initializes the day, month, and year member variables.
• The member function setDate sets the values of the day, month, and year member variables.
• The member functions getDay, getMonth, and getYear are implemented to retrieve the values of the respective member variables.
• The member function isValidDate validates if the date is valid. It performs various checks to ensure that the day, month, and year values fall within valid ranges and that the specific month.

Flowchart:

CPP Code Editor:

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