Difference between revisions of "Plus"
From Lazarus wiki
Jump to navigationJump to search (put list of usage occurrences next to code examples) |
m (→see also: linkfix) |
||
| Line 38: | Line 38: | ||
== see also == | == see also == | ||
| − | * {{Doc|package=RTL|unit=system|identifier=add|text=<syntaxhighlight lang="pascal" enclose="none">system.add</syntaxhighlight>}} | + | * {{Doc|package=RTL|unit=system|identifier=.op-add-variant-ariant-ariant|text=<syntaxhighlight lang="pascal" enclose="none">system.add</syntaxhighlight>}} |
* {{Doc|package=RTL|unit=system|identifier=concat|text=<syntaxhighlight lang="pascal" enclose="none">system.concat</syntaxhighlight>}} returns concatenation of strings | * {{Doc|package=RTL|unit=system|identifier=concat|text=<syntaxhighlight lang="pascal" enclose="none">system.concat</syntaxhighlight>}} returns concatenation of strings | ||
* {{Doc|package=RTL|unit=strings|identifier=strcat|text=<syntaxhighlight lang="pascal" enclose="none">strings.strcat</syntaxhighlight>}} returns concatenation of [[PChar|<syntaxhighlight lang="pascal" enclose="none">pchar</syntaxhighlight>]] strings | * {{Doc|package=RTL|unit=strings|identifier=strcat|text=<syntaxhighlight lang="pascal" enclose="none">strings.strcat</syntaxhighlight>}} returns concatenation of [[PChar|<syntaxhighlight lang="pascal" enclose="none">pchar</syntaxhighlight>]] strings | ||
{{Symbols}} | {{Symbols}} | ||
Revision as of 16:34, 2 November 2018
│
English (en) │
suomi (fi) │
français (fr) │
русский (ru) │
+
The symbol + (pronounced “plus”) is used to:
- explicitly indicate the positive sign of a number,
- add two numbers resulting to a number,
- form a union of sets,
- (FPC) concatenate two strings (or characters; except
pchar).
1program plusDemo(input, output, stderr);
2
3var
4 x: longint;
5 g: set of (foo, bar);
6 m: string;
7begin
8 // unary operator: positive sign
9 x := +7; // x becomes positive 7
10 x := +$100; // x becomes 256
11 // (dollar sign denotes hexadecimal base)
12
13 // addition
14 x := 7 + 7; // x becomes 14
15 x := 7 + 7 + 7 + 7 + 7 + 7; // x becomes 42
16
17 // union of sets
18 g := [foo] + [bar]; // g becomes [foo, bar]
19
20 // concatenation of strings and/or characters (FPC/Delphi extension)
21 m := 'Hello ' + 'world!'; // m becomes 'Hello world!'
22end.
In ASCII, the character code decimal 43 (or hexadecimal 2B) is defined to be + (plus sign).
see also
system.addsystem.concatreturns concatenation of stringsstrings.strcatreturns concatenation ofpcharstrings
| single characters |
|
| character pairs |
|
