Write a program to convert the time fi\'om 24-hour notation to 12-hour notation
ID: 3624618 • Letter: W
Question
Write a program to convert the time fi'om 24-hour notation to 12-hournotation and vice versa. Your program must be menu driven, giving the user
the choice of converting the time between the two notations. Furthermore,
your program must contain at least the following function: a function to convert
the time from 24-hour notation to 12-hour notation, a function to convert the
time from 12-hour notation to 24-hour notation, a function to display the
choices, function (s) to get the input, and function(s) to display the results. (For
12-hour time notation, your program must display AM or PM.)
Explanation / Answer
Program code:
// time conversion.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <iostream>
using namespace std;
void inputFormatIn24(int& hrs, int& min);
void inputFormatIn12(int& hrs, int& min, char& format);
void outputFormatIn12(int hrs, int min, char format);
void outputFormatIn24(int hrs, int min);
void convTo12hrFormat(int& hrs, char& format);
void convTo24hrFormat(int& hrs, char& format);
void menu();
int main()
{
int hrs;
int min;
char format;
int choice;
char a;
do
{
menu();//function to diplay choices
cin >> choice;
if (choice == 1)
{
inputFormatIn12(hrs, min, format);///function to get input.
convTo24hrFormat(hrs, format);//function for the conversion.
outputFormatIn24(hrs, min);//function to set output
}
else if (choice == 2)
{
inputFormatIn24(hrs, min);//function to get input.
convTo12hrFormat(hrs, format);///function for the conversion.
outputFormatIn12(hrs, min, format); //function to set output
}
else
{
break;
}
cout << " Do you want to continue?(y/n): ";
cin >> a;
} while ((a == 'Y') || (a == 'y'));
system("PAUSE");
return 0;
}
void inputFormatIn24(int& hrs, int& min)
{
cout << " Enter the hrs for the 24 hour time: ";
cin >> hrs;
cout << " Enter the min for the 24 hour time: ";
cin >> min;
}
// definition of inputFormatIn12 function
void inputFormatIn12(int& hrs, int& min, char& format)
{
cout << " Enter the hrs for the 12 hour time: ";
cin >> hrs;
cout << " Enter the min for the 12 hour time: ";
cin >> min;
cout << " Enter the AM/PM for the 12 hour time(A-AM/P-PM: ";
cin >> format;
}
// // definition of outputFormatIn12 function
void outputFormatIn12(int hrs, int min, char format)
{
cout << " The time converted to 12 hour format is:";
if (format == 'P')
{
if (min < 10) cout << hrs << ":0" << min << " P.M.";
else cout << hrs << ":" << min << " P.M.";
}
else
{
if (min < 10) cout << hrs << ":0" << min << " A.M.";
else cout << hrs << ":" << min << " A.M.";
}
}
// definition of outputFormatIn24 function
void outputFormatIn24(int hrs, int min)
{
cout << " The time converted to 24 hour format is:";
if (hrs < 12)
cout << hrs << ":" << min << " A.M.";
else cout << hrs << ":" << min << " P.M.";
}
// definition of convTo12hrFormat function
void convTo12hrFormat(int& hrs, char& format)
{
if (hrs < 12)
{
format = 'A';
}
else
{
hrs -= 12;
format = 'P';
}
}
// definition of convTo24hrFormat function
void convTo24hrFormat(int& hrs, char& format)
{
if (format == 'P')
{
hrs = hrs + 12;
}
}
void menu()///defintion of menu function
{
cout << "Menu for Time conversion";
cout << " 1.12hrs--24hrs";
cout << " 2.24hrs--12hrs";
cout << " 3.exit";
cout << " Enter your option:";
}
Sample output:
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