package inter;import lexer.*;import symbols.*;public class Arith extends Op {	public Expr expr1, expr2;	public Arith(Token tok, Expr x1, Expr x2) {		super(tok, null);		expr1 = x1;		expr2 = x2;		type = Type.max(expr1.type, expr2.type);		if(type == null)			error("type error");		}	public Expr gen() {		return new Arith(op, expr1.reduce(), expr2.reduce());	}	public String toString() {		return expr1.toString() + " " + op.toString() + " " + expr2.toString();	}}