How text is stored (ASCII, Unicode) in Intro to Computing - Quick Revision & Summary

Recall & Review

beginner

What is ASCII?

ASCII stands for American Standard Code for Information Interchange. It is a way computers represent text using numbers from 0 to 127, where each number matches a character like a letter, number, or symbol.

beginner

Why was Unicode created?

Unicode was created to represent many more characters than ASCII, including letters and symbols from almost all languages in the world, so computers can show text from different cultures correctly.

beginner

How many bits does ASCII use to store each character?

ASCII uses 7 bits to store each character, which allows for 128 different characters.

intermediate

What is the main difference between ASCII and Unicode?

ASCII uses 7 bits and can only represent 128 characters, mostly English letters and symbols. Unicode uses more bits (like 16 or 32) and can represent thousands of characters from many languages and symbols.

beginner

Give a real-life analogy for how text encoding works.

Think of text encoding like a secret codebook where each number stands for a letter or symbol. ASCII is a small codebook with only English letters, while Unicode is a huge codebook that includes letters from many languages.

What does ASCII stand for?

A Automatic System for Computer Input

B American Standard Code for Information Interchange

C Advanced Symbol Code Interface

D All Standard Characters Included

ASCII stands for American Standard Code for Information Interchange, a basic text encoding system.

How many characters can ASCII represent?

A 256

B 1,000,000+

C 65,536

D 128

ASCII uses 7 bits, allowing 128 different characters.

Why is Unicode important?

A It supports many languages and symbols

B It compresses text files

C It only works with English text

D It replaces ASCII for numbers only

Unicode supports many languages and symbols, making it useful worldwide.

Which encoding uses more bits per character?

A Both use the same

B ASCII

C Unicode

D Neither uses bits

Unicode uses more bits (like 16 or 32) to represent many characters.

If ASCII is a small codebook, what is Unicode?

A A huge codebook with many languages

B A codebook for numbers only

C A smaller codebook

D A codebook for images

Unicode is like a huge codebook that includes characters from many languages.

Explain how ASCII stores text and its limitations.

Think about how many characters fit in 7 bits and what languages ASCII supports.

Describe why Unicode is necessary and how it differs from ASCII.

Consider the variety of languages and symbols in the world.