import java.io.InputStream; import java.io.PrintStream; import java.util.Scanner;

/** * This app prompts the user for a time (in the form h:m:am or * h:m:AM or h:m:pm or h:m:PM). If the input adheres the input requirements, * then the app prints to the console the number of minutes that passed since * the start of that day or otherwise the specified feedback message. Otherwise, * this app crashes or has possibly incorrect behaviours. * * The start of the Xth day is defined as midnight of the (X-1)th day. For * instance, the start of the day Tuesday Jan 02, 2018 is defined as the * midnight of Monday Jan 1st (12:00am). See * http://en.wikipedia.org/wiki/12-hour_clock * * The smallest value is 12:00:am, for which 0 minutes have elapsed since the * start of the day (i.e., 0 hours * 60 minutes + 0 minutes = 0 + 0 = 0). * * * The value 12:00:pm refers to noon, for which 720 minutes have elapsed since * the start of the day (i.e., 12 hours * 60 minutes + 0 minutes = 720 + 0 = * 720). For hours, the meridiem "pm" starts at 12 and finishes at 11. The * largest value is 11:59:pm, for which 1439 minutes have elapsed since the * start of the day (i.e., 23 hours * 60 minutes + 59 minutes = 1380 + 59 = * 1439). When the hour 12 is reached after 11, this marks the start of the next * day and is not within the day's range of times. * * *** Required User Input *** * * (1) an input that *ideally* contains three colon-delimited tokens (e.g., * h:m:ind). Let the tokens be denoted h, m, and ind, respectively. But possibly * not. If the first and second colons are present, then the colon may be * prefixed or suffixed with an arbitrary number of space characters. * * (2) if the first colon-delimiter is present, then each of the two tokens can * *ideally* be parsed as an int. But possibly not. * * (2b) If the second colon-delimiter is present, then the third token *ideally* * will be "am" or "pm" (case-insensitive). But possibly not. * * (3) if the first token, h, can be parsed as an int, then it *ideally* has a * value 0 < h <=12, but possibly not. If the second token, m, can be parsed as * an int, then *ideally* it has a value 0 <= m <= 59, but possibly not. * * * *** App Behaviour: *** * * If the user's input does not contain two colon-delimiters, then the app does * a clean exit, with the message "Missing Colon!". * * If the user's input does contain two colon-delimiters, but the first two * tokens cannot both be parsed as ints, then the app does a clean exit, with * the message "Non-Numeric Data!". If the third token is not am or pm * (case-insensitive), then the app does a clean exit, with the message "Invalid * AM/PM indicator!". * * If the user's input contains two colon-delimiters and the tokens can be * parsed as specified above, and the first first tokens adhere to requirement * (3), then this app prints a value as described above. Otherwise, the app does * a clean exit, with the message "Values out of range!". * * If the user input is not ideal for several reasons (e.g., does not have a * colon, nor can the tokens be parsed as ints, then the app's behaviour will be * determined by the order specified above. * * *** Sample 1: *** * * Input: 11:50:am * * Output: 710 * * e.g., 11 * 60 + 50 = 710 * * *** Sample 2a: *** * * Input: 12:10:am (or 0:10:am) * * Output: 10 * * e.g., 0 * 60 + 10 = 10 (because 12:00 am is the start of the day, see above * for further explanation) * * *** Sample 2b: *** * * Input: 12:10:pm * * Output: 730 * * e.g., 12 * 60 + 10 = 730 (because 12:00 pm is the middle of the day, see * above for further explanation) * * *** Sample 2b: *** * * Input: 0:10:pm * * Output: Values out of range! * * e.g., 12 * 60 + 10 = 730 (because 12:00 pm is the middle of the day, see * above for further explanation) * * *** Sample 3: *** * * Input: 56 * * Output: Missing Colon! * * *** Sample 4: *** * * Input: "" (i.e., the empty string) * * Output: Missing Colon! * * *** Sample 5: *** * * Input: asd:asd * * Output: Non-numeric data! * * *** Sample 6: *** * * Input: 14:20 * * Output: Values out of range! * * *** Sample x: *** * * Input: 16:35:am * * Output: Values out of range! * * *** Sample x: *** * * Input: 2:30:PP * * Output: Invalid AM/PM indicator! * * *** End of Samples *** * */ public class Question05 {

public static void main(String[] args) {

final int MINS_PER_HOUR = 60; int hours; int mins; int timeElapsed; String tok1; String tok2; int colon; /* * Start by setting up variables for input and output. */ PrintStream output = System.out; Scanner input = new Scanner(System.in); // place input.close(); as the // final statement to eliminate // the compiler warning.

/* * Here is a statement that is provided to you, to get you started. We * begin by prompting the user to provide the input. */ try { final String PROMPT = "Enter \"h:m:ind\" (where 0 <= h <= 12 and 0 <= m < 60 and ind == am or pm): "; output.printf(PROMPT); String userInput = input.nextLine(); colon = userInput.indexOf(":" ); tok1 = userInput.substring(0, colon); tok2 = userInput.substring(colon + 1); colon2 = userInput.indexOf(":" ); hours = Integer.parseInt(tok1); mins = Integer.parseInt(tok2); timeElapsed = hours * MINS_PER_HOUR + mins; if((hours > 12) || (mins > 59)) { try{RuntimeException myException = new RuntimeException(); throw myException; } catch (RuntimeException e) { output.println("I have caught the exception!"); } } else if(hours == 12) { timeElapsed = mins; output.println("The time elapsed since midnight is " + timeElapsed + " mins"); } input.close(); } catch (StringIndexOutOfBoundsException e) { output.println("Missing colon!"); System.exit(0); } catch (NumberFormatException e) { output.println("Non-numeric data!"); System.exit(0); }

/* * Step 2: Read the comment block above. You will see that the * specification of the app has been changed so that the user needs to * include a third token. Solve this exercise by adding on to the * structure of Question04. */

} }