J277: Algorithms 1

What is abstraction?

• Showing step-by-step instructions that solve a problem

• Making a process more complicated than it has to be

• Identifying the important (essential) bits from a problem and leaving out the detail

• Typing and creating programming instructions for an app

A satnav map device showing a driver the directions to get to a destination is an example of...

• Decomposition

• Abstraction

• Algorithmic thinking

• Flow charts

How is decomposition used in computational thinking?

• Used to break down a complex problem into small parts

• Testing a program is more thorough

• Used to create better algorithms

• Input text is simplified

An algorithm should always show...

• Any inputs, processing and outputs of a program

• The background colour of the computer screen

• Where a program should be saved

• How much time has been spent developing a program

What is algorithmic thinking?

• The way a problem is solved, and the steps used to solve the problem

• Thinking about algorithms

• Using abstraction to create a solution to a problem

• The way programming code is put together

Which definition best describes a flow chart?

• Uses text to show the steps involved in a process

• Uses verbal language to speak instructions to the computer

• Uses symbols to draw a picture of icons in a program

• Uses symbols to show the steps in a process

Select the two types of algorithm that are used to show steps in a process.

• Plain text

• Pseudocode

• Flow chart

• Notes in an exercise book

What is a trace table?

• A technique used to trace a picture and test an algorithm

• A technique used to test algorithms and spot logical errors

• A table used to show how you edited your program code

• A table used to write down programming code line by line

What does the following pseudocode do?

print "Hello"

• Prints the words 'print Hello' to the output screen

• Prints the word 'Hello' to the output screen

• Assigns the word 'Hello' to a variable called print

• Stores the word 'Hello' as a real number

Abstraction is the simplification of real-world scenarios so that they can be better represented for designing a computer system.

• TRUE

• FALSE