Computer Science

a program that handles errors or unexpected input without crashing

code that catches and manages errors so the program doesn't crash

Designing robust programs

While loops

Using trace tables

For loops

Nested loops

Randomisation

Validating data input in a program

Programming project: iteration I

Programming project: iteration II

In this unit pupils discover how iteration is used to replicate parts of a program. They will analyse the difference between count and condition controlled iteration and how trace tables can be used to trace through loops. They will explore data validation techniques and robust program design.

Programming: iteration

What is a program called that can handle errors or unexpected input without crashing?

a program continues running after catching an error

a problem in the code that causes unexpected behaviour

Match the example with the correct concept:

because it prevents errors from happening

because its purpose is to manage errors when they occur

Why does exception handling not fix errors in the code?

using a variable before assigning it a value

trying to access an index that doesn’t exist

using a value that is the wrong type for an operation

when a variable is used before it is defined

when a function is called with the wrong arguments

using a variable that hasn’t been defined

accessing an element outside of a list’s range

What causes a ZeroDivisionError in Python?

to ensure data entered is reasonable and expected

What is the purpose of validation checks in a program?

to repeat the validation process until the data is correct

to stop the program when invalid data is entered

What is iteration used for in validation?

a program checking that a user enters a number between 1 and 10

a program allowing any input without checks

a program crashing when invalid data is entered

a program storing data without checking it

Which of these is an example of validation?

What happens if validation is not implemented correctly?

when a program stops working unexpectedly

when a program runs more slowly than usual

when a program completes a task successfully

checking whether a number is within a range

checking whether an email address is in the correct format

Which of these is NOT a validation check?

Designing robust programs

Lesson outcome