Assignment #73 and BabyCalculator

Code

      /// Name: Jason Kim
      /// Period: 7
      /// Program Name: BabyCalculator
      /// File Name: BabyCalculator.java
      /// Date Finished:11/12/15
      import java.util.Scanner;
      
      public class BabyCalculator
      {
      	public static void main( String[] args )
      	{
              Scanner keyboard = new Scanner(System.in);
      
              double a, b, c;
              String op;
      
              do
              {
                  System.out.print("> ");
                  a  = keyboard.nextDouble();
                  op = keyboard.next();
                  b  = keyboard.nextDouble();
      
                  if ( op.equals("+") )
                      c = a + b;
                  else if ( op.equals("-"))
                      c = a - b;
                  else if ( op.equals("*"))
                      c = a * b;
                  else if ( op.equals("/"))
                      c = a / b;
                  else
                  {
                      System.out.println("Undefined operator: '" + op + "'.");
                      c = 0;
                  }
      
                  System.out.println(c);
      
      		} while ( a != 0 );
                  System.out.println("Bye, now.");
      	}
      }


    

Picture of the output