case tf.TT_WORD:
case StreamTokenizer.TT_WORD:
	protected void doCalc() throws IOException {		int iType;		double tmp;		while ((iType = tf.nextToken()) != tf.TT_EOF) {			switch(iType) {			case tf.TT_NUMBER: // Found a number, push value to stack				push(tf.nval);				break;			case tf.TT_WORD:				// Found a variable, save its name. Not used here. */				variable = tf.sval;				break;			case '+':				// Found + operator, perform it immediately.				push(pop() + pop());				break;			case '-':				// Found + operator, perform it (order matters).				tmp = pop();				push(pop() - tmp);				break;			case '*':				// Multiply works OK				push(pop() * pop());				break;			case '/':				// Handle division carefully: order matters!				tmp = pop();				push(pop() / tmp);				break;			case '=':				System.out.println(peek());				break;			default:				System.out.println("What's this? iType = " + iType);			}		}	}