Write a program that prompts the user to enter time in 12-hour notation. The program then outputs the time in 24-hour notation. Your program must contain three exception classes: invalidHr, invalidMin, and invalidSec. If the user enters an invalid value for hours, then the program should throw and catch an invalidHr object. Similar conventions for the invalid values of minutes and seconds.

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:

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