String: Difference between revisions
Mr. MacKenty (talk | contribs) No edit summary |
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# this program would output the letter l (L) . | # this program would output the letter l (L) . | ||
</syntaxhighlight> | </syntaxhighlight> | ||
== Example == | == Example == | ||
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=== PHP === | === PHP === | ||
Please read [http://php.net/manual/en/language.types.string.php the official PHP page regarding single quotes, double quotes, heredoc sytnax and nowdoc syntax] | |||
<syntaxhighlight lang="php"> | <syntaxhighlight lang="php"> | ||
<?php | <?php | ||
$a = | $a = "Hello World"; | ||
?> | ?> | ||
</syntaxhighlight> | </syntaxhighlight> | ||
Revision as of 05:30, 7 August 2017
Programming basics[1]
In computer programming, a string is traditionally a sequence of characters, either as a literal constant or as some kind of variable.[2].
Because strings are a sequence of characters, we can usually select them in the same way we can select elements from an array. For example:
myString = 'Hello World'
print(mystring[2])
# this program would output the letter l (L) .
Example[edit]
Here we encounter some different syntax rules. Programming languages define strings differently. Please do pay attention to the quotation marks, double quotation marks, and triple quotation marks.
PHP[edit]
Please read the official PHP page regarding single quotes, double quotes, heredoc sytnax and nowdoc syntax
<?php
$a = "Hello World";
?>
Python[edit]
- Single quotes: 'allows embedded "double" quotes'
- Double quotes: "allows embedded 'single' quotes".
- Triple quoted: Three single quotes, """Three double quotes"""
Triple quoted strings may span multiple lines - all associated whitespace will be included in the string literal.[3]
myString = 'Hello World'
Javascript[edit]
// decimal number:
var a = 1234.65;
// a negative number:
var a = -1234.65;
Do you understand this?[edit]
Standards[edit]
- Define the terms: variable, constant, operator, object.