Unit 8 - Logic Diagrams And Truth Tables

Question 1

If the units 
0 0
0 1 
1 0 
1 1 
Are put into an AND  gate
what are the result

Answer 1

0
0
0
1

Question 2

If the units 
0 0
0 1 
1 0 
1 1 
Are put into an OR  gate
what are the result

Answer 2

0
1
1
1

Question 3

If the units 
1 
0 
Are put into an Not  gate
what are the result

Answer 3

0

1

Question 4

Explain what the logic gate AND does

Answer 4

And - both inputs must be true for the output to be true

Question 5

Explain what the logic gate OR does

Answer 5

Or - at least one input must be true for output to be true

Question 6

Explain what a NOT logic gate does

Answer 6

The output is opposite to the input

Question 7

What is data validation

Answer 7

It ensures the data entered is the right type.

Question 8

What are the 5 valdiation checks

Answer 8

Range 
Type 
Length 
Presence 
Format

Question 9

What is a range check

Answer 9

Number or date is within a allowed range

Question 10

What is a type check

Answer 10

Data is of the right type such as integer or text

Question 11

What is length

Answer 11

Text entered is not too long or short

Question 12

What is a presence check

Answer 12

Checks that data has been entered. So it isnt left blank

Question 13

What is a format check

Answer 13

Checks that the format for example a postcode or email adress

Question 14

What is verification

Answer 14

Is used to double check the data has been typed in correctly

Question 15

If a program needs to be maintained

What would this mean for the program

Answer 15

This would be improving the code,fix bugs,add new features.

Question 16

Why is it important that programs are written in a way to make them maintaible

Answer 16

Comments for other programers to undertand the program

Use of functions for other programers to undertand the program

Question 17

Why would the use of indentation improve the code ?

Answer 17

Indentation makes it possible to see which lines of code are part of the different structures

Question 18

What are ides

Answer 18

They are a number of tools that help programmers when they are programming

Question 19

Name some IDEs

Answer 19

Line numbers
Error diagnostics
Syntax highlighting

Question 20

What is syntax highlighting

Answer 20

Is where the colour of the text changes to show different parts of the program
Eg strings,keywords

Question 21

What are error diagnostics

Answer 21

Help a programmer find where they have made the mistakes

Question 22

What are sytax errors ?

Answer 22

Syntax errors are mistakes in using the language. Examples of syntax errors are missing a comma or a quotation mark, or misspelling a word.

Question 23

What is a logical error

Answer 23

Where the program runs but doesn’t do what the programer intended

Question 24

What are the 4 differnet data test types

Answer 24

Normal data
Boundary data
Invalid data
Erroneous

Question 25

What is normal test data

Answer 25

Checks single or double or triple data

Question 26

What is boundary test data

Answer 26

Tests lowest valid data and highest valid data

Question 27

What is invalid test data

Answer 27

Check negative , checks data that is over or under valid data, checks just above and below the boundary

Question 28

What is erroneous test data

Answer 28

Checks data for the wrong type of letters or symbols.

Question 29

What is a trace table useful for

Answer 29

Determining the purpose of an algorithm Finding an output to an algorithm Finding erros in an algorithm

Question 30

What is iterative testing ?

Answer 30

Tests for modules and parts of a program as the program is developed

Question 31

What is final/terminal testing

Answer 31

Tests the whole program at the end of production

Question 32

What is a string data typr

Answer 32

Letter,symobls,

Question 33

What is an integer type

Answer 33

Whole number

Question 34

What is an Real type

Answer 34

Any decimal number

Question 35

What is an boolean type

Answer 35

True or false