import java.util.Scanner;

/**
    Solution to lab - lots of loops.
*/
public class LoopsLab {

   /** 
       The main (and only) method.
       @param args not used
   */
   public static void main(String[] args) {
      Scanner kb = new Scanner(System.in);
      String nextLine = null;
      Scanner readLine;
      int transaction = -1;
      char first, last;  // for letters operation
      int rows, cols;  // for rectangle operation
      char ch;   // for rectangle operation
      int value;  // for graph operation
      String time;
      int hours, mins, secs;
      final int sixty = 60;
      int where;
      double seconds;
      final int quit = 4;
      final int graph = 3;
   
      do {
         System.out.println("\n");
         System.out.println("Please choose an operation: ");
         System.out.println("0) time");
         System.out.println("1) letters");
         System.out.println("2) rectangle");
         System.out.println("3) graph");
         System.out.println("4) quit");
         System.out.print("choice -> ");
         transaction = kb.nextInt();
         System.out.println();
         switch (transaction) {
            case quit:
               System.out.println("BYE!"); 
               break;
         
            case 0:
               System.out.print("enter time of day in HH:MM:SS format: ");
               time = kb.next();
               where = time.indexOf(':');
               hours = Integer.parseInt(time.substring(0, where));
               time = time.substring(where + 1);
               where = time.indexOf(':');
               mins = Integer.parseInt(time.substring(0, where));
               time = time.substring(where + 1);
               secs = Integer.parseInt(time);
               seconds = (hours * sixty) + mins;
               seconds = (seconds * sixty) + secs;
               System.out.printf("%.0f seconds since midnight%n", seconds);
               break;
         
            case 1:
               // System.out.println("print letters transaction");
               System.out.print("enter two letters: ");
               first = kb.next().toUpperCase().charAt(0);
               last = kb.next().toUpperCase().charAt(0);
               if (first > last) { // switch them
                  char temp = first;
                  first = last;
                  last = temp;
               }
               
               for (char c = first; c <= last; c++) {
                  System.out.print(c + " ");
               }
               System.out.println();
               break;  // end letters case
            
            case 2:
               // System.out.println("rectangle transaction");
               System.out.print("enter height, width & display character: ");
               rows = kb.nextInt();
               cols = kb.nextInt();
               ch = kb.next().charAt(0);
               for (int r = 0; r < rows; r++) {    
                  for (int c = 0; c < cols; c++) {
                     System.out.print(ch);
                  }
                  System.out.println();
               }
               break;  // end rectangle case
            
            case graph:
               // System.out.println("bar graph transaction");
               System.out.print("enter the numbers to process on one line: ");
               kb.nextLine();  // skip end of line character after menu choice
               nextLine = kb.nextLine();
               readLine = new Scanner(nextLine);
               while (readLine.hasNext()) {
                  value = readLine.nextInt();
                  for (int i = 0; i < value; i++) {
                     System.out.print("*");
                  }
                  System.out.println();
               }
               break;   // end graph case
            
            default: System.out.println("ERROR: invalid transaction code");
         } //end switch
      
      } while (transaction != quit);  // end do loop
   
   } //end main
}