import SimpleOutput;

/**
 * Test our amazing and clearly marketable difference computer.  Thanks
 * to our beloved teacher, Sam Rebelsky, for giving us the initiative
 * to create such a great product.
 *
 * Usage:
 *   ji TestDC value1 value2 ... valuen
 *
 * @author Carl "Creative Code" Caffeinated
 * @author Carla "Clearly Clever" Caffeinated
 * @version 1.0 of October 1999
 */
public class TestDC {
  public static void main(String[] args) {
    // Prepare for output.
    SimpleOutput out = new SimpleOutput();
    // The array of integers.
    int[] values = new int[args.length];
    // An index into that array;
    int numValues = 0;
    // Did the user screw up?  Assume not.
    boolean badInput = false;
    // Create something that can compute differences.
    DifferenceComputer computer = new DifferenceComputer();
    // Convert each value to an integer.  Let the user know if (s)he
    // screwed up.
    for (int i = 0; i < args.length; ++i) {
      try {
        values[numValues++] = Integer.parseInt(args[i]);
      }
      catch (NumberFormatException nfe) {
        out.println("'" + args[i] + "' is not a number");
        badInput = true;
      }
    } // for
    // If the user gave bad input, we need to update the array
    if (badInput) {
      int[] tmp = values;
      values = new int[numValues];
      for (int i = 0; i < numValues; i++) {
        values[i] = tmp[i];
      } // for
    } // if (badInput)
    // Find the biggest difference
    out.print("The greatest difference between values is: ");
    out.println(computer.greatestDifference(values));
    // And the least.
    out.print("The least difference between values is: ");
    out.println(computer.leastDifference(values));
  } // main(String[])
} // class TestDC