Computer Science

Define trace table

Can be used to record the results from each step in an algorithm; is is used to record the value of an item (variable) each time that it changes

Define format check

Checks that characters entered conform to the pattern

AND gate truth table

Everything is 0 except when both A and B are 1

NOR gate truth table

Everything is 0 except when both inputs are 0

OR gate truth table

Everything is 1 except if both are 0

NAND gate truth table

Everything is 1 except if both are 1

Name the gates in the boolean algebra

NOT gate: x = A bar Or gate: x= A + B Nor gate: x=A + B bar And gate: x= A.B Nand gate: x=A.B bar Xor gate: (A.B) + (A.B) bar

Name the 6 gates and draw them

NoT gate Or gate Nor gate And gate Nand gate Xor gate

Name the gates in the logic notation

Not gate - NOT A Or gate - A OR B Nor gate - A NOR B And gate - A AND B Nand gate- A NAND B Xor gate- A XOR B

Types of validation checks

Range, Type, Length, Presence, Format

Validation

The automated checking by a program that data is realistic and reasonable before it is accepted into a computer science

Define check digit

The final digit included in a code; it is calculated from all the other digits in the code. Check digits are used to identify errors in data entry caused by mis-typing or miss-scanning a barcode.

Day run

The manual exercise of working through an algorithm step by step

Human computer interface

The way a human links to a computer such as

NOT gate truth table

When it's zero output its 1 and when it's 1 output is 0

XOR gate truth table

When the input is is different the output is 1 and when the output is the same then they are both 0