Summary

Summary IGCSE Computer Science Notes - Chapter 1: Data Representation

0 purchase

Course
Computer Science

Institution
10th Grade

Are you a student struggling to make sense of Data Representation in Computer Science? Look no further! Our comprehensive, printable 9-page notes are specifically designed to help you excel in this critical subject. It covers all essential information needed to get A+ in an IGCSE exam (or any o...

[Show more]

Preview 2 out of 9 pages

View example

Uploaded on September 3, 2024
Number of pages 9
Written in 2023/2024
Type Summary

computer science

Institution 10th Grade
Course Computer Science
Schooljaar 200

R75,00

Add to cart

Save

100% satisfaction guarantee
Immediately available after payment
Both online and in PDF
No strings attached

Chapter 1: Data Representation
1.1 Number systems
Binary system
Base 2 number system based on the number 2. Only the values 0 and 1 can
be used to represent any numbers.

Converting from binary to denary:
Take the binary number (e.g. 11101110)
Write it out under a table that goes from right to left starting with
1,2,4,8,16 e.t.c and lasts for the whole number
Take all the values that have 1 underneath and add them together

E.g. Convert 11101110 to a denary number:
128 64 32 16 8 4 2 1

1 1 1 0 1 1 1 0

The equivalent denary number is 128 + 63 + 32 + 8 + 4 + 2 = 238

Converting from denary to binary:
- Start with the denary number
- Divide it by 2
- Write the result of the division inducing the remainder (either 0 or 1)
- Repeat until the answer is zero
- Write the remainders in reverse order

Hexadecimal system
The hexadecimal number system is closely related to the binary system. It
is a base 16 system and needs 16 different digits to represent each value.

The numbers 0-9 and the letters A-F are used to represent each digit.
A = 10 (in denary)
B = 11
C = 12
D = 13
E = 14
F = 15

, Binary places to hexadecimal values:
0000 = 0
0001 = 1
0010 = 2
0100 = 4
1000 = 8

To make more numbers you can mix them together:
0000 = 0
0001 = 1
0010 = 2
0011 = 3
0100 = 4
0101 = 5
0110 = 6
0111 =7
1000 = 8
1001 = 9
1010 = A (10)
1011 = B (11)
1100 = C (12)
1101 = D (13)
1110 = E (14)
1111 = F (15)

To convert binary to hexadecimal:
- Break it into groups of 4 bits
- Convert each group to a hexadecimal
- Put it together

Example:
Convert 111010010110101 to a hexadecimal:
0111 0100 1011 0101
Add 0 to the first group
Hexadecimal: 74B5

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

You can quickly pay through EFT, credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying this summary from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller faithchivaka. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy this summary for R75,00. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

66184 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy summaries for 15 years now

Start selling