Paper 2 Revision - IGCSE Computer Science

Put the stages of the program development life-cycle in order

• Analysis

• Design

• Coding

• Testing

Decomposition describes the process of...

• Explaining how your program works

• Code becoming difficult to test as it gets larger

• Breaking a large problem into smaller pieces

• Testing a program

Which of these is not a method used in the design stage of the program lifecycle?

• Python

• Pseudocode

• Structure Diagram

• Flowchart

Match the type of validation check to the mistake the user made during data entry

• The user tried to enter their age with a negative number

• Range check

• The user left part of the form blank

• Format check

• The user entered their age as a word instead of a number

• Length check

• The user's password is too short

• Type check

• The user forgot to include '@' in their email

• Presence check

Match the types of errors a programmer has made to its appropriate name

• Index Error

• Trying to access an element in an array that does not exist

• Syntax Error

• Forgetting to use brackets after print

• Logic Error

• The program runs, but produces the wrong answer

Match the example data with the appropriate data type

• Float / Real

• 42

• Char

• True

• Integer

• "Hello"

• String

• 3.5

• Boolean

• 'g'

Match the programming key terms with their definition

• User output

• WHILE...DO

• Pre-condition loop

• REPEAT...UNTIL

• Selection

• PRINT

• Count-controlled loop

• FOR...TO...NEXT

• Post-condition loop

• IF

In the Python code, greeting is an example of a ​ (a)   ​ because it ​ (b)   have a return value.

greeting has one ​​ (c)   called name.

Inside greeting, there is a variable called message. This is an example of a ​ (d)   variable because message can not be accessed from outside greeting.

• function
• does
• parameter
• local
• global
• does not
• procedure

a = true, b = true, c = false

x = not((a and b) and (b or c))​

The final value of x is ​ (a)  

• false
• true

Match the following

• Append data to an existing file

• open("file.txt", r)

• Create a new empty file and then add data

• open("file.txt", w)

• Read data from an existing file

• open("file.txt", a)