Difference between revisions of "Chr"
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A trivial example shall demonstrate the usage of <syntaxhighlight lang="pascal" enclose="none">chr</syntaxhighlight>: | A trivial example shall demonstrate the usage of <syntaxhighlight lang="pascal" enclose="none">chr</syntaxhighlight>: | ||
| − | <syntaxhighlight lang="pascal"> | + | <syntaxhighlight lang="pascal" highlight="10"> |
type | type | ||
// modern Latin alphabet has 26 letters | // modern Latin alphabet has 26 letters | ||
Revision as of 19:06, 12 March 2018
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The function chr returns the char which has ASCII value b.
The signature reads:
function chr(b: byte): char;
The function is used and necessary because of Pascal's strong type safety.
With the advent of typecasts a general method became available, though using chr is better style.
A trivial example shall demonstrate the usage of chr:
type
// modern Latin alphabet has 26 letters
latinAlphabetCharacterIndex = 0..25;
{$push}
// let compiler generate code ensuring n >= 0 and n < 26
{$rangeChecks on}
function getChrInLatinAlphabet(const n: latinAlphabetCharacterIndex): char;
begin
getChrInLatinAlphabet := chr(ord('A') + n);
end;
{$pop}
FPC has implemented chr as a compiler intrinsic in_chr_byte.
