Revise - 2.3 - Robust programs

• Computing
• Upper Secondary (Key Stage 4)
• GCSE

Revise - 2.3 - Robust programs

DEFENSIVE DESIGN

Forms of Defensive Design?

Anticipate Misuse

Maintain code

Verification

Validation

Reduce errors through testing

Input Sanitisation

What is input sanitisation

What does validation mean?

Validation checks?

Validation checks

Range check

Presence(existence) check

Format(type) check

Length check

Check digit

Length Check

Has a minimum amount of characters

Range Check

Falls between two set values

Presence Check

Must be filled in - cannot be blank

Format(type) check

Must be in correct format or datatype

What is authenication?

How is it different to Validation?

Describe TWO ways to more easily maintain your coded solutions [4]

Easy to Maintain

Add comments - to explain key features and understanding to code

Indentation - to separate different statements.  Makes code easier to read

Sensible naming - of variables/procedures to they are recognisable easily

Use functions/procedures - to break up reusable code to avoid duplications

Describe the purpose of testing code [2]

When should you test code?

Identify the two types of error you will encounter when programming [2]

LOGICAL

SYNTAX

a = 5

b = 2

C = a+b

print(c)

primt("hello world")

if a>b

  print("bigger")

else

 print("smaller")

name = "Bob"

print("name")

if a>18:

  print("adult")

else:

 print("child")

while a !=0:

  print(a)

4 types of test data

A system is made to store student test scores that are out of 100. Identify suitable test data to run a valid, invalid, boundary and erroneous test. Separate your answers with commas [4]