Define a class called Month that is an abstract data type for a month. Your clas
ID: 3563610 • Letter: D
Question
Define a class called Month that is an abstract data type for a month. Your class will have one member variable of type int to represent a month (1 for January, 2 for February, and so forth).Include all the following member functions: a constructor to set the month using the first three letters in the name of the month as three arguments, a constructor to set the month using an integer as an argument (1 for JAN, 2 for FEB, 3 for MAR, etc.), a default constructor, an input function that reads the month as an integer, an input function that reads the month as the first three letters in the name of the month, an output function that outputs the month as an integer, an output function that outputs the month as the first three letters in the name of the month, and a member function that returns the next month as a value of type Month. Embed your class definition in a test program.
Explanation / Answer
#include <iostream>
#include <cstdlib> // for exit()
#include <cctype> // for tolower()
using namespace std;
class Month
{
public:
//constructor to set month based on first 3 chars of the month name
Month(char c1, char c2, char c3); // done, debugged
//a constructor to set month base on month number, 1 = January etc.
Month( int monthNumber); // done, debugged
//a default constructor (what does it do? nothing)
Month(); // done, no debugging to do
//an input function to set the month based on the month number
void getMonthByNumber(istream&); // done, debugged
//input function to set the month based on a three character input
void getMonthByName(istream&); // done, debugged
//an output function that outputs the month as an integer,
void outputMonthNumber(ostream&); // done, debugged
//an output function that outputs the month as the letters.
void outputMonthName(ostream&); // done, debugged
//a function that returns the next month as a month object
Month nextMonth(); //
//NB: each input and output function have a single formal parameter
//for the stream
int monthNumber();
private:
int mnth;
};
//added
int Month::monthNumber()
{
return mnth;
}
Month Month::nextMonth()
{
int nextMonth = mnth + 1;
if (nextMonth == 13)
nextMonth = 1;
return Month(nextMonth);
}
Month::Month( int monthNumber)
{
mnth = monthNumber;
}
void Month::outputMonthNumber( ostream& out )
{
//cout << "The current month is "; // only for debugging
out << mnth;
}
// This implementation could profit greatly from use of an array!
void Month::outputMonthName(ostream& out)
{
// a switch is called for. We don't have one yet!
if (1 == mnth) out << "Jan";
else if (2 == mnth) out << "Feb";
else if (3 == mnth) out << "Mar";
else if (4 == mnth) out << "Apr";
else if (5 == mnth) out << "May";
else if (6 == mnth) out << "Jun ";
else if (7 == mnth) out << "Jul ";
else if (8 == mnth) out << "Aug";
else if (9 == mnth) out << "Sep";
else if (10 == mnth) out << "Oct";
else if (11 == mnth) out << "Nov";
else if (12 == mnth) out << "Dec";
}
void error(char c1, char c2, char c3)
{
cout << endl << c1 << c2 << c3 << " is not a month. Exiting ";
exit(1);
}
void error(int n)
{
cout << endl << n << " is not a month number. Exiting" << endl;
exit(1);
}
void Month::getMonthByNumber(istream& in)
{
in >> mnth; // int Month::mnth;
}
// use of an array and linear search could help this implementation.
void Month::getMonthByName(istream& in)
{
// Calls error(...) which exits, if the month name is wrong.
// An enhancement would be to allow the user to fix this.
char c1, c2, c3;
in >> c1 >> c2 >> c3;
c1 = tolower(c1); //force to lower case so any case
c2 = tolower(c2); //the user enters is acceptable
c3 = tolower(c3);
if('j' == c1)
if('a' == c2)
mnth = 1; // jan
else
if ('u' == c2)
if('n' == c3)
mnth = 6; // jun
else if ('l' == c3)
mnth = 7; // jul
else error(c1, c2, c3); // ju, not n or
else error(c1, c2, c3); // j, not a or u
else
if('f' == c1)
if('e' == c2)
if('b' == c3)
mnth = 2; // feb
else error(c1, c2, c3); // fe, not b
else error(c1, c2, c3); // f, not e
else
if('m' == c1)
if('a' == c2)
if('y' == c3)
mnth = 5; // may
else
if('r' == c3)
mnth = 3; // mar
else error(c1, c2, c3); // ma not a, r
else error(c1,c2,c3); // m not a or r
else
if('a' == c1)
if('p' == c2)
if('r' == c3)
mnth = 4; // apr
else error(c1, c2, c3 ); // ap not r
else
if('u' == c2)
if('g' == c3)
mnth = 8; // aug
else error(c1,c2,c3); // au not g
else error(c1,c2,c3); // a not u or p
else
if('s' == c1)
if('e' == c2)
if('p' == c3)
mnth = 9; // sep
else error(c1, c2, c3); // se, not p
else error(c1, c2, c3); // s, not e
else
if('o' == c1)
if('c' == c2)
if('t' == c3)
mnth = 10; // oct
else error(c1, c2, c3); // oc, not t
else error(c1, c2, c3); // o, not c
else
if('n' == c1)
if('o' == c2)
if('v' == c3)
mnth = 11; // nov
else error(c1, c2, c3); // no, not v
else error(c1, c2, c3); // n, not o
else
if('d' == c1)
if('e' == c2)
if('c' == c3)
mnth = 12; // dec
else error(c1, c2, c3);// de, not c
else error(c1, c2, c3);// d, not e
else error(c1, c2, c3);//c1,not j,f,m,a,s,o,n,or d
}
Month::Month(char c1, char c2, char c3)
{
c1 = tolower(c1);
c2 = tolower(c2);
c3 = tolower(c3);
if('j' == c1)
if('a' == c2)
mnth=1; // jan
else if ('u' == c2)
if('n' == c3)
mnth = 6; // jun
else if('l' == c3)
mnth = 7; // jul
else error(c1, c2, c3); // ju, not n or
else error(c1, c2, c3); // j, not a or u
else if('f' == c1)
if('e' == c2)
if('b' == c3)
mnth = 2; // feb
else error(c1, c2, c3); // fe, not b
else error(c1, c2, c3); // f, not e
else
if('m' == c1)
if('a' == c2)
if('y' == c3)
mnth = 5; // may
else
if('r' == c3)
mnth = 3; // mar
else error(c1, c2, c3); // ma not a, r
else error(c1,c2,c3); // m not a or r
else
if('a' == c1)
if('p' == c2)
if('r' == c3)
mnth = 4; // apr
else error(c1, c2, c3 ); // ap not r
else
if('u' == c2)
if('g' == c3)
mnth = 8; // aug
else error(c1,c2,c3); // au not g
else error(c1,c2,c3); // a not u or p
else
if('s' == c1)
if('e' == c2)
if('p' == c3)
mnth = 9; // sep
else error(c1, c2, c3); // se, not p
else error(c1, c2, c3); // s, not e
else
if('o' == c1)
if('c' == c2)
if('t' == c3)
mnth = 10; // oct
else error(c1, c2, c3); // oc, not t
else error(c1, c2, c3); // o, not c
else
if('n' == c1)
if('o' == c2)
if('v' == c3)
mnth = 11; // nov
else error(c1, c2, c3); // no, not v
else error(c1, c2, c3); // n, not o
else
if('d' == c1)
if('e' == c2)
if('c' == c3)
mnth = 12; // dec
else error(c1, c2, c3); // de, not c
else error(c1, c2, c3); // d, not e
else error(c1, c2, c3);//c1 not j,f,m,a,s,o,n,or d
}
Month::Month()
{
// body deliberately empty
}
int main()
{
cout << "testing constructor Month(char, char, char)" << endl;
Month m;
m = Month( 'j', 'a', 'n');
m.outputMonthNumber( cout ); cout << " ";
m.outputMonthName(cout); cout << endl;
m = Month( 'f', 'e', 'b');
m.outputMonthNumber( cout ); cout << " ";
m.outputMonthName(cout); cout << endl;
m = Month( 'm', 'a', 'r');
m.outputMonthNumber( cout ); cout << " ";
m.outputMonthName(cout); cout << endl;
m = Month( 'a', 'p', 'r');
m.outputMonthNumber( cout ); cout << " ";
m.outputMonthName(cout); cout << endl;
m = Month( 'm', 'a', 'y');
m.outputMonthNumber( cout ); cout << " ";
m.outputMonthName(cout); cout << endl;
m = Month( 'j', 'u', 'n');
m.outputMonthNumber( cout ); cout << " ";
m.outputMonthName(cout); cout << endl;
m = Month( 'j', 'u', 'l');
m.outputMonthNumber( cout ); cout << " ";
m.outputMonthName(cout); cout << endl;
m = Month( 'a', 'u', 'g');
m.outputMonthNumber( cout ); cout << " ";
m.outputMonthName(cout); cout << endl;
m = Month( 's', 'e', 'p');
m.outputMonthNumber( cout ); cout << " ";
m.outputMonthName(cout); cout << endl;
m = Month( 'o', 'c', 't');
m.outputMonthNumber( cout ); cout << " ";
m.outputMonthName(cout); cout << endl;
m = Month( 'n', 'o', 'v');
m.outputMonthNumber( cout ); cout << " ";
m.outputMonthName(cout); cout << endl;
m = Month( 'd', 'e', 'c');
m.outputMonthNumber( cout ); cout << " ";
m.outputMonthName(cout); cout << endl;
cout << endl << "Testing Month(int) constructor" << endl;
int i = 1;
while (i <= 12)
{
Month mm(i);
mm.outputMonthNumber( cout ); cout << " ";
mm.outputMonthName(cout); cout << endl;
i = i+1;
}
cout << endl
<< "Testing the getMonthByName and outputMonth* ";
i = 1;
Month mm;
while (i <= 12)
{
mm.getMonthByName(cin);
mm.outputMonthNumber( cout ); cout << " ";
mm.outputMonthName(cout); cout << endl;
i = i+1;
}
cout << endl
<< "Testing getMonthByNumber and outputMonth* " << endl;
i = 1;
while (i <= 12)
{
mm.getMonthByNumber(cin);
mm.outputMonthNumber( cout ); cout << " ";
mm.outputMonthName(cout); cout << endl;
i = i+1;
}
cout << endl << "end of loops" << endl;
cout << endl << "Testing nextMonth member" << endl;
cout << "current month ";
mm.outputMonthNumber(cout); cout << endl;
cout << "next month ";
mm.nextMonth().outputMonthNumber(cout); cout << " ";
mm.nextMonth().outputMonthName(cout); cout << endl;
cout << endl << "new Month created " << endl;
Month mo(6);
cout << "current month ";
mo.outputMonthNumber(cout); cout << endl;
cout << "nextMonth ";
mo.nextMonth().outputMonthNumber(cout); cout << " ";
mo.nextMonth().outputMonthName(cout); cout << endl;
return 0;
}
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