OCR GCSE Computer Science 2.3 Producing robust programs and 2.4 Boolean logic overview quiz quiz

Encrypting all of the data so that it is scrambled up safely before it is ever stored

Sorting every piece of input data into a strict ascending order first

Saving the input data straight to a permanent file before anything else

Checking that data entered is reasonable and acceptable before the program uses it

Using sensible, meaningful variable names

Input validation that runs as the program executes

Authentication of the user while the program runs

Range checking carried out on data at runtime

Only once at the very end of the project, on the completed program

Repeatedly during development, as each part is written

Only by the end user after the program has been released

Only if and when the program actually crashes during use

57

150

100

a letter

50

0

100

150

A logic error

A syntax error

A translation error

A boundary error

A logic error

A syntax error

A runtime data error

A boundary error

When at least one input is true

Only when both inputs are false

Only when both inputs are true

When the inputs are different

3

6

8

9

Outputs a 1 only in the case when both of its inputs are 1

Outputs a 1 whenever at least one of its two inputs is 1

Adds two separate binary numbers together to give a sum

Takes a single input and outputs the opposite value

OR gate

AND gate

NOT gate

NOR gate

Simply guess the final output value for each separate row of the table

Add intermediate columns for each part, work them out, then combine

Only fill in and test the rows of the table where input C is 1

Use just two rows of the table and ignore all the others