Using operator keyword in a switch statement

Question

So I am trying to use the "operator" keyword in this switch statement but when I do I get the error "error: expected type-specifier before â:â token operator:" I am not getting any error for the digit keyword. Any ideas?

for (i=0; i < pf.length(); i++)
  {
    int opn1;
    int opn2;
    int result;
    char token = pf[i];
    switch (token)
      {
         digit:
          {
           chast.push(token); break;
          }
         operator:
          {
           opn2 = chast.top();
           chast.pop();
           opn1 = chast.top();
           chast.pop();
           result = evaluate(opn1, token, opn2);
           chast.push(result);
           break;
          }
      }
  }

I'm trying to use the "dynamite" ingredient in my wedding cake, but when I do, the oven misbehaves. I am not getting any problems for the "wood chips" ingredient. — Kerrek SB, Oct 05 '16 at 00:08
I think it's fairly clear he's expecting it to not throw an error. — nicomp, Oct 05 '16 at 00:10
@nicomp "Not throw an error" is a long way away from "do something useful", though. — user253751, Oct 05 '16 at 00:10
Your switch statement is quite invalid. You're not specifying any `cases` (did you mean `case digit:`?), but even if you did, what are `digit` and `operator`? Are they consts in your code? Are they imaginary constructs to deduce that `token` might be a `+` symbol vs a `1` digit? — Karl Nicoll, Oct 05 '16 at 00:11
Re " I am not getting any error for the digit keyword", that's not a keyword. — Cheers and hth. - Alf, Oct 05 '16 at 00:11

score 2 · Answer 1 · edited May 23 '17 at 12:33

2

The code as presented is syntactically invalid:

It lacks the case keyword for the switch labels.
It uses the keyword operator as a name.

Re

” I am not getting any error for the digit keyword.

… that's not a keyword.

Google C++ keywords. Get yourself a decent C++ textbook to learn about the basic constructs of the language.

edited May 23 '17 at 12:33

Community

1
1

answered Oct 05 '16 at 00:15

Cheers and hth. - Alf

142,714
15
209
331

score 0 · Answer 2 · answered Oct 05 '16 at 00:09

0

In C++, operator is a keyword used only for operator overloading. Unfortunately, that makes it illegal to use in any other case.

Where is "digit" defined in your code?

answered Oct 05 '16 at 00:09

NoSeatbelts

13
1
3

I didnt define it but both show up yellow like all the other reserved words when I use them. Sorry if what I'm asking seems stupid. – Drogo Oct 05 '16 at 00:22

Using operator keyword in a switch statement

2 Answers2