Assignemnt #73 and 71th program

Code

///Name: Derrick Andreasen
///Period: 7
///Program name: 71th Program
///File name: Sev1Prog.java
///Date Finished:12/3/2015

import java.util.Scanner;

import java.util.Random;

public class Sev1Prog
{
	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 );
	}
}

Picture of the output