Assignment #73 and Baby Calculator

Code

        //Name: Mark Katz
    ///Period: 6
    ///Program Name: Baby Calculator
    ///File Name: babycalc.java
    ///Date Finished: 10/29/15 
import java.util.Scanner;

public class babycalc
{
	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 && b!=0 );
        System.out.println("Bye, now" );
        
	}
}

     
    

Picture of the output