Difference between revisions of "&/pt"
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| − | Em [[ASCII/pt|ASCII]], o caractere de código decimal <syntaxhighlight lang="pascal" | + | Em [[ASCII/pt|ASCII]], o caractere de código decimal <syntaxhighlight lang="pascal" inline>38</syntaxhighlight> (ou em [[Hexadecimal/pt|<syntaxhighlight lang="pascal" inline>$</syntaxhighlight>]]<syntaxhighlight lang="pascal" inline>26</syntaxhighlight>) é, por definição, <syntaxhighlight lang="pascal" inline>&</syntaxhighlight> (chamado de “E comercial”). |
== Pascal == | == Pascal == | ||
=== Base octal === | === Base octal === | ||
| − | Em [[Pascal/pt|Pascal]] o <syntaxhighlight lang="pascal" | + | Em [[Pascal/pt|Pascal]] o <syntaxhighlight lang="pascal" inline>&</syntaxhighlight> denota um número em base octal. |
<syntaxhighlight lang="pascal" line highlight="9"> | <syntaxhighlight lang="pascal" line highlight="9"> | ||
program messageNo(input, output, stderr); | program messageNo(input, output, stderr); | ||
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end. | end. | ||
</syntaxhighlight> | </syntaxhighlight> | ||
| − | In an octal base only the characters <syntaxhighlight lang="pascal" | + | In an octal base only the characters <syntaxhighlight lang="pascal" inline>0</syntaxhighlight> through and including <syntaxhighlight lang="pascal" inline>7</syntaxhighlight> are allowed. |
| − | An optional sign is specified in front of the <syntaxhighlight lang="pascal" | + | An optional sign is specified in front of the <syntaxhighlight lang="pascal" inline>&</syntaxhighlight>. |
As a passing remark, in a production program the number in the above example is better written as | As a passing remark, in a production program the number in the above example is better written as | ||
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=== Caractere de escape === | === Caractere de escape === | ||
[[FPC|FreePascal]] retroactively declared some new [[Reserved word|reserved words]]. | [[FPC|FreePascal]] retroactively declared some new [[Reserved word|reserved words]]. | ||
| − | In order of being capable of compiling old code with an up-to-date [[Compiler|compiler]] version, which might fail due to those new reserved words, FPC declared the <syntaxhighlight lang="pascal" | + | In order of being capable of compiling old code with an up-to-date [[Compiler|compiler]] version, which might fail due to those new reserved words, FPC declared the <syntaxhighlight lang="pascal" inline>&</syntaxhighlight> as an escape character. |
| − | Thus, without refactoring the code but escaping, i.e. prepending an <syntaxhighlight lang="pascal" | + | Thus, without refactoring the code but escaping, i.e. prepending an <syntaxhighlight lang="pascal" inline>&</syntaxhighlight> to the [[Identifier|identifier]], the compiler accepts the actual reserved word as a valid identifier. New code though shall come up with different identifier names, without utilizing this feature. |
== Lazarus == | == Lazarus == | ||
| − | No [[Lazarus/pt|Lazarus]] o <syntaxhighlight lang="pascal" | + | No [[Lazarus/pt|Lazarus]] o <syntaxhighlight lang="pascal" inline>&</syntaxhighlight> é usado para |
| − | * indicar teclas de atalho em [[TMenuItem|<syntaxhighlight lang="pascal" | + | * indicar teclas de atalho em [[TMenuItem|<syntaxhighlight lang="pascal" inline>TMenuItem</syntaxhighlight>]] |
{{Symbols}} | {{Symbols}} | ||
Latest revision as of 17:11, 6 August 2022
│
English (en) │
suomi (fi) │
français (fr) │
português (pt) │
русский (ru) │
Em ASCII, o caractere de código decimal 38 (ou em $26) é, por definição, & (chamado de “E comercial”).
Pascal
Base octal
Em Pascal o & denota um número em base octal.
1program messageNo(input, output, stderr);
2
3uses
4 baseUnix;
5
6begin
7 // withdraw group write access to current terminal
8 // equivalent to invoking: mesg n
9 fpChmod('/dev/stdin', &0600);
10end.
In an octal base only the characters 0 through and including 7 are allowed.
An optional sign is specified in front of the &.
As a passing remark, in a production program the number in the above example is better written as
fpChmod('/dev/stdin', S_IRUSR or S_IWUSR);
since it is more meaningful than having a raw number. Pascal is a high-level language. Use this advantage. Write what you mean, not what in fact the computer does.
Nota: Literais numéricos em octal não são suportados pelos modos Caractere de escape
FreePascal retroactively declared some new reserved words.
In order of being capable of compiling old code with an up-to-date compiler version, which might fail due to those new reserved words, FPC declared the & as an escape character.
Thus, without refactoring the code but escaping, i.e. prepending an & to the identifier, the compiler accepts the actual reserved word as a valid identifier. New code though shall come up with different identifier names, without utilizing this feature.
Lazarus
No Lazarus o & é usado para
- indicar teclas de atalho em
TMenuItem
| single characters |
|
| character pairs |
|
