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Just for curiosity,
Why in Delphi, if we defined an empty char by:
a:Char;
a:='';
we get an error: Incompatible types: ‘Char’ and ‘string’
However, if we placed
a:='a';
it will be fine?
Is it necessary to define an empty char by: a:=#0?
A char is a single (that is, exactly one) character. So ‘a’, ‘∫’, and ‘⌬’ are all OK, but not ‘ab’ (a two-character string), ‘Hello World!’ (a twelve-character string), or ” (a zero-character string).
However, the NULL character (#0) is a character like any other.
In addition, the character datatype is implemented as a word (in modern versions of Delphi), that is, as two bytes. If all these values 0, 1, …, 2^16 – 1 are used for real characters, how in the world would you represent your ’empty char’?