Authors:
Walter Savitch ,kenrick Mock
Chapter:
Parameters And Overloading
Exercise:
Programming Projects
Question:1 | ISBN:9780132846813 | Edition: 5
Question
Write a program that converts from 24-hour notation to 12-hour notation. For example, it should convert 14:25 to 2:25 P.M. The input is given as two integers. There should be at least three functions: one for input, one to do the conversion, and one for output. Record the A.M./P.M. information as a value of type char , 'A' for A.M. and 'P' for P.M. Thus, the function for doing the conversions will have a call-by-reference formal parameter of type char to record whether it is A.M. or P.M. (The function will have other parameters as well.) Include a loop that lets the user repeat this computation for new input values again and again until the user says he or she wants to end the program.
Answer
Program:
#include<iostream>
void overviewData( );
void inputData(int &hr,int &min);
void convert12Format(int &hr,char &type);
void displayData(int hr,int min,char type);
int main()
{
using namespace std;
int hours,min;
char type,choice;
overviewData( );
do
{
inputData(hours,min);
convert12Format(hours,type);
displayData(hours,min,type);
cout<<"To continue then press'y':";
cin>>choice;
}while(choice=='y');
}
void overviewData( )
{
using namespace std;
cout << "Converts 24-hour to 12-notation.\n";
cout<<"-----------------------------------\n";
}
//Read hours and minutes from the key board
void inputData(int &hr,int &min)
{
using namespace std;
cout<<"Enter hours:";
cin>>hr;
cout<<"Enter minutes:";
cin>>min;
}
//Convert 24 hours format to 12 hours format
void convert12Format(int &hrs,char &type)
{
if(hrs>12 )
{
hrs=hrs%12;
type='P';
}
else
type='A';
}
//Result on screen
void displayData(int hrs,int min,char t)
{
using namespace std;
cout<<"12-hour notation:"<<endl;
cout<<hrs<<":"<<min<<" "<<t<<"M"<<endl;
}
Output:
Converts 24-hour to 12-notation.
-------------------------------------------
Enter hours:14 25
Enter minutes:12-hour notation:
2:25 PM
To continue then press'y':y
Enter hours:23 00
Enter minutes:12-hour notation:
11:0 PM
To continue then press'y':n