Unit 3
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User Interface:
the inputs and outputs that allow a user to interact with a piece of software. User interfaces can include a variety of forms such as buttons, menus, images, text, and graphics.
Input:
data that are sent to a computer for processing by a program. Can come in a variety of forms, such as tactile interaction, audio, visuals, or text.
Output:
any data that are sent from a program to a device. Can come in a variety of forms, such as tactile interaction, audio, visuals, or text.
• Program Statement:
a command or instruction. Sometimes also referred to as a code statement.
• Program:
a collection of program statements. Programs run (or “execute”) one command at a time.
Sequential Programming:
program statements run in order, from top to bottom.
Event Driven Programming:
some program statements run when triggered by an event, like a mouse click or a key press
Documentation:
a written description of how a command or piece of code works or was developed.
• Comment:
form of program documentation written into the program to be read by people and which do not affect how a program runs.
Pair Programming:
a collaborative programming style in which two programmers switch between the roles of writing code and tracking or planning high level progress (not explicitly taught)
Debugging:
Finding and fixing problems in an algorithm or program.
Development process:
the steps or phases used to create a piece of software. Typical phases include investigating, designing, prototyping, and testing
• Event:
associated with an action and supplies input data to a program. Can be generated when a key is pressed, a mouse is clicked, a program is started, or by any other defined action that affects the flow of execution.
Incremental Development Process:
a design approach that breaks the problem into smaller pieces and makes sure each piece works before adding it to the whole.
Iterative Development Process:
a design approach requires refinement and revision based on feedback, testing, or reflection throughout the process. This may require revisiting earlier phases of the process.
Program Requirements/Specifications:
descriptions how a program functions and may include a description of user interactions that a program must provide
• Syntax Error:
a mistake in the program where the rules of the programming language are not followed.
Logic Error:
a mistake in the program in which the program runs without error but does not behave in its intended way.
Software:
A program or a collection of programs
What four components do all computers have?
input, storage, process, and output.
what are the five phases of app development?
-investigating, designing, prototyping (building), testing and reflecting.
when setting the setPosition command, the coordinates (0,0) begins where on the screen?
top left corner