Difference between revisions of "Byte"
m (Text replace - "delphi>" to "syntaxhighlight>") |
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For example: | For example: | ||
| − | < | + | <syntaxhighlight> |
var | var | ||
c: byte; | c: byte; | ||
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c := 'A'; ch := 65; { while they are the same action, this is illegal } | c := 'A'; ch := 65; { while they are the same action, this is illegal } | ||
end. | end. | ||
| − | </ | + | </syntaxhighlight> |
The use of byte or char as a data type provides better documentation as to the purpose of the use of the particular variable. The byte type can be [[coersion|coerced]] to char by using the '''[[chr]]''' function. Char type values can be coerced to byte by using the '''[[ord]]''' function | The use of byte or char as a data type provides better documentation as to the purpose of the use of the particular variable. The byte type can be [[coersion|coerced]] to char by using the '''[[chr]]''' function. Char type values can be coerced to byte by using the '''[[ord]]''' function | ||
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The above program corrected to legal use: | The above program corrected to legal use: | ||
| − | < | + | <syntaxhighlight> |
var | var | ||
c: byte; | c: byte; | ||
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c := ord('A'); ch := Chr(65); { now legal ... ch := Chr(65); is equivalent to ch := #65} | c := ord('A'); ch := Chr(65); { now legal ... ch := Chr(65); is equivalent to ch := #65} | ||
end. | end. | ||
| − | </ | + | </syntaxhighlight> |
{{Data types}} | {{Data types}} | ||
[[Category:Pascal]] | [[Category:Pascal]] | ||
Revision as of 14:56, 24 March 2012
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A byte is an unsigned integer in the range of 0 .. 255. A byte is 8 bits long. A byte and a char are the same thing, except a byte can only be referred to as a numeric type, while a char can be used as a character, or as part of a string type, and cannot be used in an arithmetic expression.
For example:
var
c: byte;
ch: char;
begin
c := 65; ch := 'A'; { are the same action, and are legal }
c := 'A'; ch := 65; { while they are the same action, this is illegal }
end.The use of byte or char as a data type provides better documentation as to the purpose of the use of the particular variable. The byte type can be coerced to char by using the chr function. Char type values can be coerced to byte by using the ord function
The above program corrected to legal use:
var
c: byte;
ch: char;
begin
c := 65; ch := 'A'; { are the same action, and are legal }
c := ord('A'); ch := Chr(65); { now legal ... ch := Chr(65); is equivalent to ch := #65}
end.
| simple data types |
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| complex data types |
