Assignemnt #73 and Baby Calculator

Code

    ///Name: Daniel Tiffany-Appleton
    ///Period: 7
    ///Program Name: Baby Calculator
    ///File Name: BabyCalculator
    ///Date Finished: 12/10/15
    
    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( "Shutting Down." );
    	}
    }


    

Picture of the output