String

Programming basics

In computer programming, a string is traditionally a sequence of characters, either as a literal constant or as some kind of variable..

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

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

Please click the following link to read the official PHP page regarding single quotes, double quotes, heredoc sytnax and nowdoc syntax

<?php
$a = "Hello World";
?>

Python

• 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.

myString = 'Hello World'

Javascript

// decimal number:
var a = 1234.65; 
// a negative number:
var a = -1234.65;

Standards

• Define the terms: variable, constant, operator, object.

Give the precise meaning of a word, phrase, concept or physical quantity.

A unit of abstract mathematical system subject to the laws of arithmetic.

A value less than zero ( 0 ) with a sign opposite to its positive counterpart.

Give the precise meaning of a word, phrase, concept or physical quantity.