Re: "strings are delimited by double quote character", where there's a character variable

[Shark8 <onewingedshark@gmail.com>]

On Friday, December 1, 2017 at 8:08:41 AM UTC-7, Mehdi Saada wrote:
> I got a a Character variable gnat says it is a String, while functions taking it as parameter take only Characters. Mentions of the variable in the procedure: 
> C: Character := ''; -- strings are delimited by double quote character
> while C /= '' loop 
>         Get(C); PUSH(C); 
> end loop; 
> while (C /= '') loop -- same here        
>         Get(C); 
>         PUSH(C); 
> end loop;

The character you are using is referred to in Ada as "Apostrophe" (See Package Ada.Characters.Latin_1) the character referred to as a double-quote character is "Quotation". -- Respectively, these are Character'(''') and Character'('"').

String and Character are two separate types, though related, and are therefore not interchangeable. / A String is an array of Character, and thus can be specified via aggregate as ('H', 'e', 'l', 'l', 'o')... this would be rather tedious and so there exists a bit of syntactic sugar to specify a String: these are the Quotation delimiters and result in the previous value also being representable as "Hello".