brtunately, change ans that itS to objects from input file, since it doesn't work if a user enters Date::jan. Write a toMonth function that can be used to enter a month as an integer. Throw invalid_argument if it fails. |Month m = toMonth(3); // returns Month:: mar udts.cpp 1 #include 2 #include 3 #include "date.h" 4 using namespace std; 5 6 /** Construct a valid Month. 7 @param mm the month in the range 1-12 @exception throw invalid_argument if out of range. @return the correct Month. 9 10 11 */ 12 Month toMonth(int mm) 13 { 14 15 16 17 } Demo.cpp 1 #include 2 #include 3 #include "date.h" 4 using namespace std; 5 6 int main() cout « "Enter date as mm/dd/yyyy: "; int mm, dd, yyyy; char slash; cin » mm » slash » dd » slash » yyyy; 9 10 11 12 13 try { Date d = makeDate (toMonth(mm), dd, yyyy); cout « "The date is " « d « endl; 14 15 16 17 18 catch (invalid_argument& e) { cout « e.what () « endl; 19 20 21

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question
Unfortunately, the change from int to Month means that it's harder to read Date objects from an
input file, since it doesn't work if a user enters Date::jan. Write a toMonth function that can be
used to enter a month as an integer. Throw invalid_argument if it fails.
Month m = toMonth (3); // returns Month::mar
udts.cpp
1 #include <string>
2 #include <stdexcept>
3 #include "date.h"
using namespace std;
4
6.
/**
Construct a valid Month.
7
8.
@param mm the month in the range 1-12
9.
@exception throw invalid_argument if out of range.
@return the correct Month.
10
11
*/
Month toMonth(int mm)
{
12
13
14
15
16
17 }
Demo.cpp
1 #include <iostream>
2 #include <string>
3 #include "date.h"
4 using namespace std;
5
6
int main()
7 {
cout « "Enter date as mm/dd/yyyy: ";
int mm, dd, yyyy;
char slash;
cin >> mm >> slash » dd >> slash » yyyy;
8
10
11
12
13
try
{
Date d = makeDate (toMonth(mm), dd, yyyy);
cout <« "The date is " << d << endl;
}
catch (invalid_argument& e)
{
cout « e.what() « endl;
}
14
15
16
17
18
19
20
21
22 }
Transcribed Image Text:Unfortunately, the change from int to Month means that it's harder to read Date objects from an input file, since it doesn't work if a user enters Date::jan. Write a toMonth function that can be used to enter a month as an integer. Throw invalid_argument if it fails. Month m = toMonth (3); // returns Month::mar udts.cpp 1 #include <string> 2 #include <stdexcept> 3 #include "date.h" using namespace std; 4 6. /** Construct a valid Month. 7 8. @param mm the month in the range 1-12 9. @exception throw invalid_argument if out of range. @return the correct Month. 10 11 */ Month toMonth(int mm) { 12 13 14 15 16 17 } Demo.cpp 1 #include <iostream> 2 #include <string> 3 #include "date.h" 4 using namespace std; 5 6 int main() 7 { cout « "Enter date as mm/dd/yyyy: "; int mm, dd, yyyy; char slash; cin >> mm >> slash » dd >> slash » yyyy; 8 10 11 12 13 try { Date d = makeDate (toMonth(mm), dd, yyyy); cout <« "The date is " << d << endl; } catch (invalid_argument& e) { cout « e.what() « endl; } 14 15 16 17 18 19 20 21 22 }
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