Answer:
invalidHr.h
//Implement the header file
#pragma once
#include <iostream>
#include <string>
using namespace std;
//Declare class and thrown an exception
class invalidHr : public exception
{
//Implement the member function
public:
virtual const char* what() const throw()
{
//return the message
return "The value of hr must be between 0 and 12.";
}
};
invalidMin.h
#pragma once
//Implement the header file
#include <iostream>
#include <string>
using namespace std;
//Declare class and thrown an exception
class invalidMin : public exception
{
//Implement the member function
public:
virtual const char* what() const throw()
{
//return the message
return "The value of minutes must be between 0 and 59." ;
}
};
invalidSec.h
//Implement the header file
#pragma once
#include <iostream>
#include <string>
using namespace std;
//Declare class and thrown an exception
class invalidSec : public exception
{
//Implement the member function
public:
virtual const char* what() const throw()
{
//return the message
return "The value of seconds must be between 0 and 59.";
}
};
Driverclass.cpp:
//include header files
#include<iostream>
#include<string>
#include "invalidHr.h"
#include "invalidMin.h"
#include "invalidSec.h"
using namespace std;
//function prototypes
int getHours();
int getMinutes();
int getSeconds();
void print24HourTime(int hr, int min, int sec, string str);
//Main method
int main()
{
//Declare variables
int hours;
int minutes;
int seconds;
string str;
//call methods to get the hours,minutes and seconds
hours = getHours();
minutes = getMinutes();
seconds = getSeconds();
//Prompt and read AM or PM
cout << "Enter AM or PM: ";
cin >> str;
cout << endl;
//Print the output line
cout << "24 hour clock time: ";
//call the methods to print the time
print24HourTime(hours, minutes, seconds, str);
system("pause");
return 0;
}
//Implement the method hetHours()
int getHours()
{
//declare bool flag
bool done = false;
//declare hours
int hr = 0;
//Using do-while loop and try catch block
//to repeat the loop until user enters valid hours.
//Otherwise thown an exception
do
{
try
{
cout << "Enter hours: ";
cin >> hr;
cout << endl;
if (hr < 0 || hr > 12)
throw invalidHr();
done = true;
}
catch (invalidHr hrObj)
{
cout << hrObj.what() << endl;
}
} while (!done);
//return hours
return hr;
}
//Using do-while loop and try catch block
//to repeat the loop until user enters valid minutes.
//Otherwise thown an exception
int getMinutes()
{
bool done = false;
int min = 0;
do
{
try
{
cout << "Enter minutes: ";
cin >> min;
cout << endl;
if (min < 0 || min > 59)
throw invalidMin();
done = true;
}
catch (invalidMin minObj)
{
cout << minObj.what() << endl;
}
} while (!done);
return min;
}
//Using do-while loop and try catch block
//to repeat the loop until user enters valid seconds.
//Otherwise thown an exception
int getSeconds()
{
bool done = false;
int sec = 0;
do
{
try
{
cout << "Enter seconds: ";
cin >> sec;
cout << endl;
if (sec < 0 || sec > 59)
throw invalidSec();
done = true;
}
catch (invalidSec secObj)
{
cout << secObj.what() << endl;
}
} while (!done);
return sec;
}
//Implement the methods to print the hours minutes and seconds
void print24HourTime(int hr, int min, int sec, string str)
{
if (str == "AM")
{
if (hr == 12)
cout << 0;
else
cout << hr;
cout << ":" << min << ":" << sec << endl;
}
else if (str == "PM")
{
if (hr == 12)
cout << hr;
else
cout << hr + 12;
cout << ":" << min << ":" << sec << endl;
}
}
Explanation:
