import cs1.Keyboard;
/**
   calculate simple statistics based on input numbers.
   @author Greg Vogl
   last modified 2003-09-22
*/
public class Numbers
{
   /**
      calculate simple statistics based on input numbers.
      <br>input: floating point numbers
      <br>output: sum, product, minimum, maximum, average
      @throws IOException to handle bad input
   */
   public static void main (String[] args) 
   {
      // state the purpose of this program
      System.out.println("This program calculates statistics of input numbers.");

      // get input
      final int MAX_NUMBERS = 100;
      float[] f = new float[MAX_NUMBERS];
      int n = 0;
      String input;
      do
      { 
         System.out.println("Enter a number (or q to quit) and press Enter.");
         input = Keyboard.readString();
         if (!input.equals("q"))
            f[n++] = Float.parseFloat(input);
      } while (!input.equals("q"));

      // exit if the user typed "q"
      if (n == 0) System.exit(0);

      // calculate statistics
      float sum = 0;
      float product = 1;
      float minimum = f[0];
      float maximum = f[0];
      for (int i=0; i<n; i++) 
      {
         sum += f[i];
         product *= f[i];
         if (f[i] < minimum) minimum = f[i];
         if (f[i] > maximum) maximum = f[i];
      }
      float average = sum / n;

      // output results
      System.out.println(sum + "\tSum");
      System.out.println(product + "\tProduct");
      System.out.println(minimum + "\tMinimum");
      System.out.println(maximum + "\tMaximum");
      System.out.println(average + "\tAverage");
   }
}