/* AddExpr.java */

/** A class to represent addition expressions. 
 */
public class AddExpr extends BinaryExpression {

  /** Constructs an addition expression with operands x and y.
   * @param x the first operand
   * @param y the second operand
   */
  public AddExpr(Expression x, Expression y) {
    /* Fill in for part 1. */
  }

  public String oper() {
    return "+";
  }

  public Value eval(Value v1, Value v2) {
    /* Fill in for part 1. */
  }
}