/** Opération binaire, Exp  char Exp. */
public class ExpOpBin extends Exp {
  public Exp e1, e2;
  public char op;
  public ExpOpBin(Exp e1, char op, Exp e2) {
    super(e1, e2); this.e1 = e1; this.op = op; this.e2 = e2;
  }
  public String toString() { return super.toString() + "(" + op + ")"; }
  public Integer eval() {
    int i1 = e1.eval();
    int i2 = e2.eval();
    switch (op)  {
    case '+' : return i1+i2;
    case '-' : return i1-i2;
    case '*' : return i1*i2;
    case '/' : return i1/i2;
    case '%' : return i1%i2;
    }
    return 0;
  }
  public void accept(AstVisitor v) { v.visit(this); }
}