Programming

A451

Databases I do not understand therefore ......................................................................... The End YAY!




what is a db
give example of serial file db
                           " sequential db
db view
external
conceptual
physical
what is flat file db
what is hierarchical db

A451 - Networks

LAN (Local Area Network) supplies internet to a group of internet enabled devices in close proximity to each other such as a router in a house. This is useful for stuff like wireless printing however they have rubbish range therefore if you have an average sized house it is more than likely you will have very poor signal.

Software

First post of 2014 is to do with software ....... YAY!!!

So basically just use: http://benveggie1917computerprogramming451.blogspot.co.uk

cause that kid knows everything and it is a great blog for information.



QUESTIONS

1.) How can an IDLE help a programmer when producing source code ?

Colour codes your program and can check for syntax errors.



2.) Little Johnny is a systems manager of a large insurance company. He is choosing a general purpose        office software for the staff to use. He is considering installing open source software.
     a.) State what is meant by open source software.

Open source software is released with its source code and it can be modified.


     b.) Describe two reasons in favour of using open source software in this situation and also state two reasons against.


might be more suitable than the commercial equivalent
usually free
but
lack of support
may not be available for your required platform




3.) Describe the following types of common utility programs.
     a.) Editor
     b.) Disk Defraggers
     c.) Firewall

-Editor is a software for entering and editing text files
-Disk Defraggers reorganise memory/storage after you have removed/deleted files to make the software    run faster
-Firewalls restrict incoming and outgoing things for security reasons.

Binary

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Questions:
a) Define the terms bit, nibble, byte, kilobyte, megabyte, gigabyte & terabyte.
       
          Bit            =      a binary digit 1 or 0
          Nibble      =      4 bits (half a byte)
          Byte         =      8 bits
          Kilobyte   =      1024 bytes
          Megabyte =      1024 kilobytes
          Gigabyte  =      1024 megabytes
          Terabyte   =      1024 gigabytes

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Visit : www.my.dynamic-learning.co.uk

Instruction Set

"the complete set of all the instructions in machine code that can be recognized and executed by a central processing unit."

a great iPad app that I highly recommend as an example of this is 'Hand Basic'

Binary, Hex and ASCII.

Binary is made up of 1's and 0's.
The most common use of binary is 8-bit binary.
Which goes right to left in the order 1, 2, 4, 8, 16, 32, 64, 128
167 in 8-bit Binary would be

128 | 64 | 32 | 16 | 8 | 4 | 2 | 1
1     | 0   | 1   | 0   | 0 | 1 | 1 | 1

Hex goes in sets of 16
so the Hex number 32 the 3 stands for 3 sets of 16 (48) and 2 extra so that would be 50
A=10 B=11 C=12 D=13 E=14 F=15

ASCII conversion table below |
                                                V

The Denary Number is : 167
The Binary is : 10100111
The Hex is : A7
The ASCII is : Den - 495455
                        Hex - 313637
                        Bin - 0011 0001  0011 0110 0011 0111