#include <iostream>
#include <string>
#include <stdlib.h>
#include <vector>

using namespace std;

main()
{
    char repeat = 'Y';
    cout << "This program will convert 12-hour time format into 24-hour time format." << endl;
    cout << "Please make sure the time you input is in the correct format as stated below, WITH THE SPACE between the time and AM/PM." << endl;

    do {

    int hour;   //Collects the hour.
    char colon;     //Collects the colon from the time.
    int minutes;     //Collects the minute.
    string ampm;    //Collects the AM/PM ending.

    cout << "Pleas enter a time in 12-hour format (HH:MM AM/PM)." << endl;
    cin >> hour >> colon >> minutes >> ampm;

    if (hour > 12 || hour <= 0 || minutes < 0 || minutes > 59) //Checks to make sure the time is valid.
    {
        cout << "Please enter the time in the correct format." << endl;
        hour = 0;
        continue;
    }

    //Following block converts the time from 12-hour to 24-hour by adding 12 to hour if the time is PM. If AM and hour is 12, hour is turned into 00.

    int i = 0; //Int for the loop and the loop only.

    do { //Loop that can't be broken unless broken out of.
        if (ampm == "AM" && hour == 12)
        {
            hour = 0;  //Sets hour to 0 since it's the morning.
            if (minutes < 10)
            {
                cout << "0" << hour << "0" << minutes << endl;
                break;
            }
            cout << "0" << hour << minutes << endl; //Outputs the time with 0 at front
            break; //Breaks out of the loop
        }
        else if (ampm == "PM")
        {
            hour += 12; //Adds 12 to the hour to convert it to 24-hour format.
            if (hour < 10)
            {
                if (minutes < 10)  //Checks to make sure the minutes will have a 0 in front if less than 10.
                {
                    cout << "0" << hour << "0" << minutes << endl;
                    break;
                }
                cout << "0" << hour << minutes << endl; //Outputs the time with 0 at front to fit format.
                break; //Breaks out of the loop
            }
            if (minutes < 10)  //Checks to make sure the minutes will have a 0 in front if less than 10.
                {
                    cout << hour << "0" << minutes << endl;
                    break;
                }
            cout << hour << minutes << endl; //Outputs the converted time.
            break; //Breaks out of the loop
        }
        else
        {
            hour = hour;
            if (hour < 10)
            {
                if (minutes < 10)  //Checks to make sure the minutes will have a 0 in front if less than 10.
                {
                    cout << "0" << hour << "0" << minutes << endl;
                    break;
                }
                cout << "0" << hour << minutes << endl; //Outputs the time with 0 at front to fit format.
                break; //Breaks out of the loop
            }
            if (minutes < 10)  //Checks to make sure the minutes will have a 0 in front if less than 10.
                {
                    cout << hour << "0" << minutes << endl;
                    break;
                }
            cout << hour << minutes << endl; //Outputs the converted time.
            break; //Breaks out of the loop
        }
    } while(i == 0);

    //Function repeat block
    cout << "Would you like to convert another time? (Y/N)" << endl;
    cin >> repeat;
    toupper(repeat);

    } while (repeat == 'Y');

    return 0;
}