Question

Time Displacement (12-hour format)

Write a program that requests the current time and a waiting time as two integers for the number of hours and the number of minutes to wait. The program then outputs what the time will be after the waiting period. Use 24-hour notation for the input time and 12-hour notation for the output time. Include a loop that lets the user repeat this calculation for additional input values until the user says she or he wants to end the program.

Each iteration of the loop will process 5 inputs:

1. Current hour
2. Current minute
3. Waiting period hour
4. Waiting period minute
5. Whether or not to continue the loop

Sample execution:

Enter current hour: 12
Enter current minute: 00
Enter waiting period hour: 4
Enter waiting period minute: 25
The time will be 04:25PM
Continue? (y/n): y

Enter current hour: 0
Enter current minute: 15
Enter waiting period hour: 72
Enter waiting period minute: 00
The time will be 12:15AM
Continue? (y/n): n

c++

Answer 1

Code

===============================================================

#include <iostream>
#include <string>
using namespace std;
int main() {
//declare variables for storing the inputs
   string choice;
int current_h;
int current_min;
int wait_h;
int wait_min;

//infinite while loop
   while(true)
{
//input for current hour and min
cout<<"Enter current hour: ";
cin>>current_h;
cout<<"Enter current minutes:";
cin>>current_min;
//input for period hour and min
cout<<"Enter waiting period hour: ";
cin>>wait_h;
cout<<"Enter waiting period minute: ";
cin>>wait_min;

//add hours and mins
//remember that input is taken in 24 hour format
int hour = current_h+wait_h;
int mins = current_min+wait_min;

//if minutes are greater than 60 after adding than
//increase hour by 1 and decrease nins by 60
if(mins>60)
{
mins-= 60;
hour+= 1;
}
//now if houra are greater than taking modulo with 24 will
//give the exact hours
hour=hour%24;
//we can also get hours as 0 but final output should be in
//12 hour format so change it to 12
if(hour==0){hour=12;}
unsigned int number_of_digits = 0;
int n = hour;
do {
++number_of_digits;
n /= 10;
} while (n);
//if hour is smaller than 12 then its AM
if(hour<=12)
{

if(number_of_digits==1){
cout<<"The time will be "<<0<<hour<<":"<<mins<<"AM"<<endl;
}
else{
cout<<"The time will be "<<hour<<":"<<mins<<"AM"<<endl;
}

}
//otherwise its PM
else
{

hour-=12;
n = hour;
do {
++number_of_digits;
n /= 10;
} while (n);
if(number_of_digits==1){
cout<<"The time will be "<<0<<hour<<":"<<mins<<"PM"<<endl;
}
else{
cout<<"The time will be "<<hour<<":"<<mins<<"PM"<<endl;
}
}
//ask the user to continue the loop or not
cout<<"Continue?(y/n):";
   cin>>choice;
   cout<<"\n"<<endl;
   if(choice=="n"){
break;
   }
   }
}
===================================================================

OUTPUT