public double Visit(UnaryExpr un)
{
un.Right.accept(this);
if (un.OP == OPERATOR.PLUS)
{
Console.Write(" + ");
}
else if (un.OP == OPERATOR.MINUS)
{
Console.Write(" - ");
}
return(Double.NaN);
}
public double Visit(UnaryExpr un)
{
un.Right.accept(this);
if (un.OP == OPERATOR.PLUS)
{
eval_stack.Push(eval_stack.Pop());
}
else if (un.OP == OPERATOR.MINUS)
{
eval_stack.Push(-eval_stack.Pop());
}
return(Double.NaN);
}
public double Visit(UnaryExpr un)
{
if (un.OP == OPERATOR.PLUS)
{
return(+un.Right.accept(this));
}
else if (un.OP == OPERATOR.MINUS)
{
return(-un.Right.accept(this));
}
return(Double.NaN);
}
