Program:

Following is the C++ program to convert the time from 24-hour notation to 12-hour notation.

#include <iostream>
using namespace std;
char conversion(int& hours);
void getTime(int& hours, int& minutes);
void output(int hours, int minutes, char result);
int main(){
 int hours, minutes;
 char answer;
do{
getTime(hours, minutes);
 char cp = conversion(hours);
output(hours, minutes, cp);
cout<< "\nDo you want to calculate for more time? ";
cin>> answer;
}while(answer == 'Y' || answer == 'y');
cout<< "\nThank you! ";
 return 0;
}
void getTime(int& hours, int& minutes){
 //Enter the hours and minutes as call-by-reference parameters
cout<< "Enter the time in hours: ";
cin>> hours;
cout<< "Enter the time in minutes: ";
cin>> minutes;
}
char conversion(int& hours){
 char result;
 int division;
if(hours <= 12){
 result = 'A';
 }
else{
 division = hours % 12;
if(division == 0){
 hours = 00;
 }
else{
 hours = division;
 }
 result = 'P';
 }
 return result;
}
void output(int hours, int minutes, char result){
cout<< "The time is: " << hours<< ":" << minutes << " " << result << "M";
cout<<endl;
}

Explanation:

In the above program, under main function, getTime() function which has two parameters. Hours and minutes is called to enter the values of hours and minutes. After that, conversion() function which has one parameter is called and output is stored in the variable cp. Finally, the output() function is used to display the result.

Sample Output:

Enter the time in hours: 15 
Enter the time in minutes: 24 
The time is: 3:24 PM 
Do you want to calculate for more time? y 
Enter the time in hours: 11 
Enter the time in minutes: 39 
The time is: 11:39 AM 
Do you want to calculate for more time? n 
Thank you!