ascii

• ASCII and unicode is a

  character encoding system
• A starts at 65
• What does ASCII stand for?

  American Standard Code for Information Interchange
• How do we convert decimal numbers into binary code?

  By identifying place value columns and adding
• What is the binary representation of the letter A?

  65 in decimal, which is $1000001$ in binary
• How many bits does ASCII use?

  Seven bits
• What is the maximum number of characters ASCII can represent?

  127 different characters
• What types of characters does ASCII represent?

  Uppercase letters, lowercase letters, digits, symbols
• What is the limitation of ASCII?

  It cannot represent many languages and emojis
• What does Unicode do differently than ASCII?

  It can represent a wider range of characters
• How many bits can Unicode use?

  8, 16, or 32 bits
• How many characters can Unicode support?

  Over 2 billion characters
• What happens when you save a file with a single character 'A' in Notepad?

  It saves as one byte
• What file size results from saving a Unicode character?

  Four bytes
• Why does a Unicode character take more space than an ASCII character?

  Unicode uses more bits to store characters
• What are the key differences between ASCII and Unicode?

  • ASCII uses 7 bits; Unicode uses 8, 16, or 32 bits
  • ASCII supports 127 characters; Unicode supports over 2 billion
  • ASCII is limited to basic symbols; Unicode includes emojis and diverse languages
• How can you test the difference between ASCII and Unicode in Notepad?

  1. Type 'A' and save as ASCII (1 byte)
  2. Type an emoji (e.g., smiley face) and save as Unicode (4 bytes)