assignment 3

#include<iostream>

#include <algorithm>

#include <string>

using namespace std;

int main()

{

                //paralle arrays for mont names and days

                string names[] = {"January","February", "March", "April", "May", "June", "July", "August","September", "October", "November", "December"};

                int days[] = {31,28,31,30,31,30,31,31,30,31,30,31};

                //parallel arrays for day name and number

                string weeks[] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

                int week_num[] = {1,2,3,4,5,6,7};



                string month_name,day; //to get month name and day

                int year; //to store year

                //ask user to enter month and store it in month_name

                cout<<"\nEnter the name of a month> ";

                cin>>month_name;

                //loop till user enters stop

                while(true)

                {

                                int month[6][7] = {0}; //initialize month array with all zeroes

                                //ask user to enter year

                                cout<<"\nEnter the year for "<<month_name<<"> ";

                                cin>>year;

                                //ask user to enter day name

                                cout<<"\nEnter the name of the day on which this month starts> ";

                                cin>>day;

                                //print out month and year

                                cout<<"\n   "<<month_name<<"   "<<year<<endl;

                                int n, start;//n for no. of days in month and start for month starting day

                                bool flag = false; //to cheack year is leap or not

                                int i,j, k; //to itearate

                                //get no. of days

                                for(i=0;i<12;i++)

                                {

                                                std::transform(month_name.begin(), month_name.end(), month_name.begin(), ::tolower);

                                                std::transform(names[i].begin(), names[i].end(), names[i].begin(), ::tolower);

                                                //if month found

                                                if(month_name == names[i])

                                                {

                                                                //if february, check for leap year

                                                                if(month_name == "february")

                                                                {

                                                                                if(year%400==0)

                                                                                                flag = true;

                                                                                else if(year%100==0)

                                                                                                flag = false;

                                                                                else if(year%4==0)

                                                                                                flag = true;

                                                                }

                                                                //if leap year and february then add 1 to days and assign to n

                                                                if(flag==true)

                                                                                n = days[i]+1;

                                                                //if not leap year or not february then assign days to n

                                                                else

                                                                                n = days[i];

                                                                break;

                                                }

                                }

                                //get starting day

                                for(i=0;i<7;i++)

                                {

                                                std::transform(day.begin(), day.end(), day.begin(), ::tolower);

                                                std::transform(weeks[i].begin(), weeks[i].end(), weeks[i].begin(), ::tolower);

                                                if(day==weeks[i])

                                                {

                                                                start = week_num[i];

                                                                break;

                                                }

                                }

                                //add values to month array

                                for(i=0,j=0;(i<6&&j<(n+start));i++)

                                {

                                                for(k=0;k<7;k++)

                                                {

                                                                j++; //increment j which represents positions 0 to 41

                                                                //if position is greater and less than end position (where last date to store)

                                                                if(j>=start-1 && j<=(n+start-1))

                                                                {

                                                                                month[i][k] = j-start+1; // add day

                                                                }

                                                }

                                }

                                //print calendar

                                for(i=0;i<6;i++)

                                {

                                                for(j=0;j<7;j++)

                                                {

                                                                //if 0 then print 3 spaces

                                                                if(month[i][j]==0)

                                                                                cout<<"   ";

                                                                //if single digit add 1 space in front and at end

                                                                else if(month[i][j]<10)

                                                                                cout<<" "<<month[i][j]<<" ";

                                                                //if double digit then add one space at end

                                                                else

                                                                                cout<<month[i][j]<<" ";

                                                }

                                                cout<<endl; //end line

                                }

                                //ask user to continue or stop

                                cout<<"\nEnter the name of a month or stop to quit> ";

                                cin>>month_name;

                                //if stop then break loop

                                if(month_name=="stop")

                                                break;

                                cin.ignore();

                }

                return 0;

}