Java 1.2 How-To/JavaHowTo.iso/javafile/ch02/Tip.java

Java Source | 1998-12-14 | 1.9 KB | 68 lines

import java.io.*;

/*
 * Tip.class calculates the tip, given the bill and tip percentage
 */

class Tip {
public static void main (String args[]) {
       String input = "";
       int tip_percent=0;
       double bill=0, tip=0;
       boolean error;

      BufferedReader in = new BufferedReader (new InputStreamReader(System.in));

       do {
               error = false;
               System.out.print ("Enter the bill total > ");
               System.out.flush ();
               try {
                      input = in.readLine ();
               } catch (IOException e) {
                      System.out.println (e);
                      System.exit (1);
               }

/*
 * Convert input string to double,
*/
               try {
                      bill = Double.valueOf (input).doubleValue();
} catch (NumberFormatException e) {
                      System.out.println (e);
                      System.out.println ("Please try again");
                      error = true;
               }
       } while (error);

        do {
               error = false;
               System.out.print ("Enter the tip amount in percent > ");
System.out.flush ();
               try {
                       input = in.readLine ();
               } catch (IOException e) {
                       System.out.println (e);
                       System.exit (1);
               }

/*
 * This time convert to Integer
 */
               try {
                      tip_percent = Integer.valueOf (input).intValue();
} catch (NumberFormatException e) {
                      System.out.println (e);
                      System.out.println ("Please try again");
                      error = true;
               }
       } while (error);

       System.out.print ("The total is ");
        tip = bill * ((double) tip_percent)/100.0;
        System.out.println (bill + tip);
} // end of main ()
}