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input
A program gets data, perhaps from a file, keyboard, touchscreen, network, etc.
process
A program performs computations on that data, such as adding two values like x + y.
Output
A program puts that data somewhere, such as to a file, screen, network, etc.
variable
Used by programs to refer to data. It is a named item, used to hold a value.
flowchart
A graphical language for creating computer programs.
Program
A list of statements, each statement carrying out some action and executing one at a time.
Run, execute
Words for carrying out a program's statements.
String literal
Text (characters) within double quotes.
Characters
Any letter (a-z, A-Z), digit (0-9), or symbol (~, !, @, etc.).
newline
Special two-character sequence \n whose appearance in an output string literal causes the cursor to
move to the next output line.
comment
Text a programmer adds to a program, to be read by humans (other programmers), but ignored by
the program when executing.
Moore's Law
Engineers have reduced switch sizes by half about every 2 years.
bit
A single 0 or 1.
, byte
Eight bits. Ex. 11000101
ASCII
American Standard Code for Information Interchange. Code that is the numerical representation of a
character. Ex. Z would be stored in a computer as 1011010.
Pseudocode
Text that resembles a program in a real programming language but is simplified to aid human
understanding.
assignment statement
Assigns a variable with a value, such as X=5.
variable declaration
declares a new variable, specifying the variable's name and type.
integer
Variable type that can hold whole numbers.
Expression
Can be a number, a variable name (numApples), or a simple calculation like (numApples + 1).
Identifier
A name created by a programmer for an item like a variable or function. Must be a sequence of
letters, underscores, and digits or start with a letter or underscore. They are case sensitive.
Reserved word (or keyword)
A word that is part of the language, like integer, Get or Put. These words cannot be used as an
identifier.
Naming conventions
A set of style guidelines defined by a company, team, teacher, etc., for naming variables.
Lower camel case
Capitalize each word except the first, as in numApples.
Operator
A symbol that performs a built-in calculation, like the + which performs addition.
Precedence rules
An expression is evaluated using the order of standard mathematics.
Incremental development