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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?
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You can use c[i]= '\0' or simply c[i] = (char) 0 . The null/empty char is simply a value of zero, but can also be represented as a character with an escaped zero.
An empty char value does not belong to any char, so Java gives a compile-time error. To create an empty char, we either can assign it a null value \0 or default Unicode value \u0000 .
An empty string is a string instance of zero length, whereas a null string has no value at all. An empty string is represented as "" . It is a character sequence of zero characters.
The Char type represents a single character, just as it does in standard Pascal. You can cast any integer type to a character by using the Char type name in a type cast. Unlike some other type casts, the size of the integer value does not have to match the size of a Char.
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'?
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