Authors:
Walter Savitch ,kenrick Mock
Chapter:
Constructors And Other Tools
Exercise:
Programming Projects
Question:1 | ISBN:9780132846813 | Edition: 5
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 construc- tor 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 January, 2 for February, and so forth), 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.
Answer
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
using namespace std;
class Month
{
public:
Month(char m_firstLetter, char m_secondLetter, char m_thirdLetter);
Month(int monthInt);
Month();
void outputMonthInt();
void outputMonthLetters();
Month nextMonth();
private:
int month;
};
int main()
{
int monthInt;
char firstL, secondL, thirdL;
char test;
do {
cout << endl;
cout << "Testing the default constructor" << endl;
Month d;
d.outputMonthInt();
d.outputMonthLetters();
cout << endl;
cout << "Testing the constructor with one integer arguement" << endl;
cout << "Enter a month number: ";
cin >> monthInt;
if (monthInt <= 12 && monthInt >= 1)
{
Month num(monthInt);
num.outputMonthInt();
num.outputMonthLetters();
}
else
{
cout << "Invalid number for month, please choose from 1-12\n";
cout << "Enter a month number: ";
cin >> monthInt;
Month num(monthInt);
num.outputMonthInt();
num.outputMonthLetters();
}
cout << endl;
cout << "Testing the constructor with 3 letters as arguements" << endl;
cout << "Enter the first letter of a month in lowercase form: ";
cin >> firstL;
cout << "Enter the second letter of a month in lowercase form: ";
cin >> secondL;
cout << "Enter the third letter of a month in lowercase form: ";
cin >> thirdL;
cout << endl;
cout << "You have entered: " << firstL << secondL << thirdL << endl;
Month letter(firstL, secondL, thirdL);
letter.outputMonthLetters();
letter.outputMonthInt();
cout << endl;
cout << "Testing the member function that returns the next month as a value of type Month" << endl;
cin >> monthInt;
if (monthInt <= 12 && monthInt >= 1)
{
Month i(monthInt);
Month type = i.nextMonth();
cout << "Next Month" << endl;
type.outputMonthInt();
type.outputMonthLetters();
}
else
{
cout << "Invalid number for Month, choose between 1-12\n";
cout << "Enter a month nummber: ";
cin >> monthInt;
Month i(monthInt);
Month type = i.nextMonth();
cout << "Next Month" << endl;
type.outputMonthInt();
type.outputMonthLetters();
}
cout << endl;
cout << "Do you want to keep testing? y/n ";
cin >> test;
} while (test == 'y' || test == 'Y');
system("pause");
}
Month Month :: nextMonth()
{
if (month == 12)
return Month(1);
else
return Month(month + 1);
}
Month:: Month()
{
month = 1;
}
Month:: Month(int monthInt)
{
month = monthInt;
}
Month::Month(char first, char second, char third)
{
if ((first == 'j') && (second == 'a') && (third == 'n'))
month = 1;
if ((first == 'f') && (second == 'e') && (third == 'b'))
month = 2;
if ((first == 'm') && (second == 'a') && (third == 'r'))
month = 3;
if ((first == 'a') && (second == 'p') && (third == 'r'))
month = 4;
if ((first == 'm') && (second == 'a') && (third == 'y'))
month = 5;
if ((first == 'j') && (second == 'u') && (third == 'n'))
month = 6;
if ((first == 'j') && (second == 'u') && (third == 'l'))
month = 7;
if ((first == 'a') && (second == 'u') && (third == 'g'))
month = 8;
if ((first == 's') && (second == 'e') && (third == 'p'))
month = 9;
if ((first == 'o') && (second == 'c') && (third == 't'))
month = 10;
if ((first == 'n') && (second == 'o') && (third == 'v'))
month = 11;
if ((first == 'd') && (second == 'e') && (third == 'c'))
month = 12;
}
void Month :: outputMonthInt()
{
if (month >= 1 && month <= 12)
cout << "Month: " << month << endl;
else
cout << "Error - the month is not valid!" << endl;
}
void Month :: outputMonthLetters()
{
switch (month)
{
case 1:
cout << "Jan" << endl;
break;
case 2:
cout << "Feb" << endl;
break;
case 3:
cout << "Mar" << endl;
break;
case 4:
cout << "Apr" << endl;
break;
case 5:
cout << "May" << endl;
break;
case 6:
cout << "Jun" << endl;
break;
case 7:
cout << "Jul" << endl;
break;
case 8:
cout << "Aug" << endl;
break;
case 9:
cout << "Sep" << endl;
break;
case 10:
cout << "Oct" << endl;
break;
case 11:
cout << "Nov" << endl;
break;
case 12:
cout << "Dec" << endl;
break;
default:
cout << "Error - the month is not valid!" << endl;
}
}