7.1, 7.2 (w/o loops), 7.5, 7.6

Question 1

a dog cant talk

the stages of a PDLC (program development life cycle)

4

Answer 1

1. analysis,
2. design,
3. coding
4. testing

Question 2

Analysis

PDLC

Answer 2

identification of the problem and requirements
uses two techniques-
* abstraction,
* decomposition
…of the problem

Question 3

abstraction

Answer 3

the act of removing unimportant details of the problem to focus on important elements

Question 4

decomposition

Answer 4

breaks down a complex problem into smaller parts which can then be subdivided and easily solved

Question 5

Design

Answer 5

how a problem should be executed is planned and documented using
* flowcharts,
* pseudocode
* structure diagrams

Question 6

Coding

Answer 6

writing the program code and the code is tested, amended and repeated until the module performs as required

Question 7

testing

Answer 7

testing program code with the use of test data to detect and fix the errors in the program

Question 8

computer system

PDLC

Answer 8

every computer system is made up of sub-systems, which are made up of further sub-systems

Question 9

Components of a computer system/results of decomposition (4)

Answer 9

• Inputs
• Outputs
• Processes
• Storage

Question 10

Top down design

Answer 10

Decomposition of a computer system into subsystems until each system performs a single action

Question 11

What is data validation?

Answer 11

Validation is an automated check carried out by a computer to make sure the data entered is reasonable

Question 12

The different types of validation checks

6

Answer 12

• Range checks
• Length checks
• Type checks
• Presence checks
• Format checks
• Check digits

Question 13

range check

Answer 13

to test if the data input falls between a given upper bound and a given lower bound

Question 14

length check

Answer 14

To test if the data input is under a certain number of characters

Question 15

Type Check

Answer 15

To test if the data input is of the correct data type

Question 16

Pressence check

Answer 16

make sure that input data has been entered and that the input box has not been left empty

Question 17

Format check

Answer 17

Format checks make sure that input data is of a predefined pattern

Question 18

What is verification check

Answer 18

To test if the data input is the same as the data that was intended to be input

Question 19

Vefification check methods

Answer 19

• double entry check
• visual checks

Question 20

Double entry checking

Answer 20

• Expects each item of data to be entered twice and compares both entries to check they are the same,
• if not the data entry opterator is asked to re-enter data

Question 21

Visual check

Answer 21

• The user visually checks the data on the screen. A message then asks if the data is correct before proceeding.
• If it isn’t the user then renters the data

Question 22

For trace tables what does MOD mean

Answer 22

MOD= remainder of your division

Question 23

For trace tables what does DIV mean

Answer 23

DIV= the answer for your division

Question 24

Char

Answer 24

data type for single charcter like A, F, G

Question 25

What are the Test Datas

4

Answer 25

Normal
Abnormal
Extreme
Boundary

Question 26

Extreme data

Answer 26

• the largest/smallest acceptable value

Question 27

Boundary data

Answer 27

• Boundary data is the largest/smallest acceptable value or the corresponding smallest/largest rejected value,
• so can be within the range and not be in the range just close to the largest/smallest acceptable value, just at the boundary

Question 28

Normal data

Answer 28

normal test data is data that a system would be expected to handle, within range

Question 29

Abnormal data

Answer 29

• erroneous data, abnormal data is data that is expected to fail and should be rejected by the system
• Wrong data type like- entering numbers (integer) instead of someone’s name (string), or entering text instead of numbers
• such as: abc, 7&n, Harry, £300, <!%, etc