Unit 15: Vocabulary

To pass this unit, please study the 16 vocabulary words below.
& (ampersand)
a key which is used in many languages to mean 'and'
In SQL queries it is best practice to spell out 'AND' and not just use the ampersand (&) as a shortcut.
* (asterisk)
the character which often means "multiply" in a math equation or "match all" in a RegEx wildcard
The programmer could not remember whether to use an asterisk (*) or a percent sign (%) as a wildcard in his SQL regular expression.
@ (at sign)
the sign often used in email addresses to separate usernames from domain names
The at sign key is often in very different locations on many international keyboards
\ (back slash)
a key used for separating files and folders, normally in a Windows file system.
The users files were located in 'C:\documents and settings\gregbrady\my documents'
brackets
the punctuation marks '{' and '}' used in pairs to set apart or interject text within other text
In programming languages, brackets are often used to denote blocks of executable code.
case
in typography, this is the distinction between capital (big) and lower (small) letters
In order to change case on a computer, the user typically presses the "Shift" key
/ (forward slash)
a key used to separate folders and files, often used in Unix file systems
the user's php binary was located in /usr/local/php
> (greater than sign)
the sign which means that the value on the right is less than the value on the left
5 > 3
< (less than sign)
the sign which means that the value on the left is smaller than the value on the right
3 < 5
- (minus sign)
The operator sign often indicating the process of subtraction or difference
The program did not output the expected result because the programmer forgot a minus sign.
parentheses
the punctuation marks '(' and ')'used in pairs to group values or sets of values.
Parentheses are often used to group values in an equation.
% (percent sign)
the sign meant to show a common measurement based on a fraction of 100
The CEO reported that sales were up 75% over last quarter.
+ (plus sign)
the operator sign normally indicating the operation of addition
The elementary school teacher told the students that 2 plus 2 equals 4.
square brackets
the punctuation marks '[' and ']' used in pairs to set apart or interject text within other text
In programming languages, the use of square brackets are sometimes used to show the elements of an array.
~ (tilde)
this key normally means "approximately" in mathematics; in Unix systems this character is used to represent a home directory
The student learned that his home directory was 'home/~johndoe' and his web directory was 'http://www.university.co.uk/students/johndoe'.
_ (underscore)
a character often used in file names to join words without using a space; originally used on typewriters to make underlined text
The long file name "hippy_dippy_string_concatenation.pl" contained many underscores because spaces aren't advised in Unix file names.
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