Weaknesses 2.1 - 2.5

Question 1

Symbol for MOD

Answer 1

%

Question 2

Symbol for DIV

Answer 2

/ /

Question 3

Casting?

Answer 3

Changing one data type into another

Question 4

Types of Input Validation

Answer 4

Range Check - Checks data is within a certain range.
Type Check - Checks data is a certain data type.
Format Check - Checks data is entered in a certain way.
Presence Check - Checks that data has actually been entered and not left blank.
Lookup Table - A table of acceptable entries, also known as a list.
Length Check - Checks the length of the input is within a certain amount.

Question 5

Iterative Testing

Answer 5

The programmer develops a module, tests it and repeats this process until the module works as expected.

Question 6

Final Testing

Answer 6

This testing takes place once all modules have been individually tested to ensure the whole program works as originally expected.

Question 7

Details of High Level Languages

Answer 7

Easier to understand than Low level Language
Similar to human language
Must be translated into machine code for CPUs as they be executed directly
Fewer errors

Question 8

Details of Low Level Languages

Answer 8

Two types - Machine Code, Assembly Language
Hard to read and understand
Machine code can be directly processed and executed
Executes faster

Question 9

Details of Compiler

Answer 9

Executes program all at once/ Translates all source code at once
Faster run programs- More efficient
Large complex programs
Shows all errors in the program at the end

Question 10

Details of Interpreter

Answer 10

Translates code one line at time
Slower than compiler
Smaller, simpler programs
Encounters the error and then reports it to the user immediately and stops the program from running

Question 11

Contents of IDE

Answer 11

Error Diagnostics
Syntax Highlighting
Line Numbers
Code Editor

Question 12

What : equal to

Answer 12

Then

Question 13

How to add to a list?

Answer 13

.append

Question 14

How to delete from list?

Answer 14

.pop

Question 15

How to find length of a list

Answer 15

len
E.g length = len(dates)

Question 16

How to sort a list?

Answer 16

.sort()

Question 17

How to read, write and add to a file?

Answer 17

r , w , a
E.g (“customers.txt”,”r”)
(“customers.txt”,”w”)
(“customers.txt”,”a”)

Question 18

Maintainability

Answer 18

Comments - To understand the purpose of each line of code
Subprograms - To reuse code, Easier to test
Indentation - To Improve readability
Appropriate variable names - Ensuring the purpose of a variable is immediately understood
Using Constants - Keeps code consistent,Making it easier to read and debug

Question 19

Abstraction

Answer 19

Ignoring unnecessary information and focusing on important facts

Question 20

Declare an array

Answer 20

array names[4]

Question 21

Declare 2D array

Answer 21

array grid[3,5]