ap comp sci principles 2nd six weeks

expression

a group of symbols that can contain values, variables, and operators

assignment

when a value is put into a variable

strongly types variables

variables that can only contain a specific format of data, like numbers or text

weakly typed variables

variables that can hold different formats of data, like text or numbers

variable contents

some variables can hold any kind of data, others can only hold specific types of data, depending on the language

variable naming

the name should describe the data

variable 

it has a name and holds a value that can be changed

list

an ordered group of items

index

a unique number that identifies each element of a list

element

an item in a list

data abstraction 

makes programming simpler 

string

an ordered group of characters

what happens if you try to use an index number that does not exist in a particular list

it causes an error

MOD

the remainder of the dived

selection

when an algorithm makes a decision 

pseudocode

algorithms that can be read by people but not run by a computer

iterating

repeating

evaluate an expression

determine what the value is

sequencing 

steps arranged in a particular order

how many characters can a string contain

depending on the language, possibly very many

data stored in a string variable

text or characters

what happens if you attempt to access string index numbers that are higher than the number of characters in the string

it causes an error

what happens if "yyy" is concatenated with "zzz"

yyyzzz

concatenate

link in a chain or series, when 2 or more strings are placed together to make a larger string

index number

identifies characters inside a string

substring

part of an existing string

character

a single symbol that may or may not be visible

how individual characters inside of a string are identified

using index numbers that start at 1