From what I have learnt in classes of week 2, I revised about computers. We learnt about what does computer mean and why we should use it. Actually, I already knew about it, but I got more new information's and moreover I revised about computers.
Computer - is a programmable machine that carries out what it has been instructed to do.
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| PC (Personal Computer) |
As we know, computers are not a living things. It has been created by humans. So it has own command or operations which gives us desired results. So, we learned the basic operations of computer.
Actually, there are four main operations, such as:
The five activities in graph above forms the information processing cycle.
Actually, there are four main operations, such as:
* Input
* Processing
* Output
* Storage
One more operation:
* Communication.
* Communication.
Computer Components:
- Hardware – the physical parts (the electrical, electronic or mechanical parts of a computer)
- Software – the set of instructions/ programs (also known as a program – a series of related instructions, organized for a common purpose. It tells the computer what task to perform and how to do it)
- People
- Data/ Information
Also in week 2, I learned about the Number Systems. There are 4 types of number systems:
- Decimal Number Systems (It uses ten numerals to form a string of numbers. The values are 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9)
- Binary Number Systems (It uses two numerals/ digits to form a string of numbers. They are 0 and 1. Also known as BITS)
- Octal Number Systems (It uses eight numerals to form a string of numbers. They are 0, 1, 2, 3, 4, 5, 6 and 7 )
- Hexadecimal Number Systems (It uses sixteen symbols (numerals + letters) to form a string of numbers. They are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D and E. Also known as Hex)
Example: Let me show you one of the examples how to convert and use number systems, for instance let's take conversion from Binary to Decimal:
Convert 11012 to Decimal.
How? Use this table and multiply the digits with the position values
Convert 11012 to Decimal.
How? Use this table and multiply the digits with the position values
11012 = (1x 23) +
(1x 22) + (0 x 21) +
(1x 20)
= (1x 8) + (1x 4) + (0 x 1) + (1x1)
= 8 + 4 + 0 + 1 = 13
Therefore, 11012 = 1310
So, in class on Thursday we also did in class activity, our lecturer gave us the task. The task was to solve the examples which were related about Number Systems, we had to convert them. Based on that task, I have practiced and understood this topic better.
