Question

write a program that computes and displays the number of days that have elapsed between January 1, 1900 and today (the day the program is run).

The program must be designed as follows:

Within a class named Elapsed_Days, provide the following functions:

• bool is_year_valid(long year)

returns true if year is >= 1900; otherwise false

• bool is_month_valid(long month)

returns true if month is between 1 and 12 (inclusive); otherwise false

• bool is_leap_year(long year) returns true if year is a leap year

• long return_days_in_month(long year, long month) returns the number of days for the month month in year year

• long return days_in_year(year) returns the number of days in year

• void set_elapsed_days(long elapsed_days) sets the field value set_elapsed_days

• long get_elapsed_days()

returns the field value set_elapsed_days

• void compute_elapsed days()

returns the number of days elapsed between January 1, 1900 and the day the program is run

• void display_elapsed_days()

displays the number of days elapsed in the form “The number of days elapsed since Jan 1, 1900 is xxxx.” Where xxxx is the number of the elapsed days

• A constructor that determines the number of elapsed days

• A suitable destructor

Within a main(...) driver function:

• Instantiates an instance of elapsed_days

• Displays the number of elapsed days

c++

Answer 1

#include<iostream>
using namespace std;

class Elapsed_Days
{
        // members to store the current date, month, year and total days elapsed since 1900
        private:
                long curr_year, curr_month, curr_day, total_elapsed_day;
                
        
        public:
                // constructor, checking whether the data entered is correct or not
                Elapsed_Days(long year, long month, long day)
                {
                        // if the data is correct then setting that data.
                        if(is_year_valid(year) && is_month_valid(month))
                        {
                                curr_year = year;
                                curr_month = month;
                                curr_day = day;
                        }
                        // if the date is not valid
                        else
                        {
                                cout<<"Date is not valid"<<endl;
                                exit(1);
                        }
                        
                }
                
                // destructor
                ~Elapsed_Days()
                {
                        cout<<"In deconstructor";
                }
                
                // checking if the year passed is valid or not
                bool is_year_valid(long year)
                {
                        if(year >= 1900)
                                return true;
                        
                        return false;
                }
                
                // checking if the month passed is valid or not
                bool is_month_valid(long month)
                {
                        if(month <= 12 && month >=1)
                                return true;
                                
                                return false;
                }
                
                // checking if the given year is a leap year or not
                bool is_leap_year(long year)
                {
                        if(year%100 == 0)
                        {
                                if(year%400 == 0)
                                        return true;
                                        
                                return false;
                        }
                        else
                        {
                                if(year%4 == 0)
                                        return true;
                                        
                                return false;
                        }
                }
                
                // calculating the number of days in a month
                long return_days_in_month(long year, long month)
                {
                        bool is_leap = is_leap_year(year);
                        
                        if(month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12)
                        {
                                return 31;
                        }
                        else if(month == 4 || month == 6 || month == 9 || month == 11)
                        {
                                return 30;
                        }
                        else
                        {
                                if(is_leap)
                                        return 29;
                                        
                                return 28;
                        }       
                }
                
                //calculating the number of days in a given year
                long return_days_in_year(long year)
                {
                        if(year == curr_year)
                        {
                                long days = 0;
                                for(int i=1; i<curr_month; i++)
                                {
                                        days += return_days_in_month(year,i);
                                }
                                // counting till last day
                                days += curr_day-1;
                                return days;
                        }
                        else
                        {
                                if(is_leap_year(year))
                                {
                                        return 366;
                                }
                                return 365;
                        }
                }
                
                // setting the field value
                void set_elapsed_days(long elapsed_days)
                {
                        total_elapsed_day = elapsed_days;
                }
                
                // computing the total number of days elapsed
                void compute_elapsed_days()
                {
                        long days = 0;
                        for(int i=1900 ; i<=curr_year; i++)
                        {
                                days += return_days_in_year(i);
                        }
                        set_elapsed_days(days);
                }
                
                // showing the number of days elpased
            void display_elapsed_days()
            {
                compute_elapsed_days();
                cout<<"The number of days elapsed since Jan 1, 1900 is "<<total_elapsed_day<<endl;
                }
                
                
                
                long get_elapsed_days()
                {
                        return total_elapsed_day;
                }
                        
};

int main()
{
        long day, month, year;
        
        cout<<"Enter the day:"<<endl;
        cin>>day;
        
        cout<<"Enter the month:"<<endl;
        cin>>month;
        
        cout<<"Enter the year:"<<endl;
        cin>>year;
        
        Elapsed_Days d1(year, month,day);
        d1.display_elapsed_days();
}