🔠 ASCII Table Study Guide
📘 What is ASCII?
ASCII (American Standard Code for Information Interchange) is a character encoding standard used to represent text in computers and other devices that use text.
- Assigns a numeric value (0–127) to letters, digits, symbols, and control characters.
- Used widely in programming, data transmission, and system design.
🧠 Key Concepts to Learn
1. ASCII Range
| Range | Characters | Example |
|---|
| 0–31 | Control Characters | \n (newline), \t (tab) |
| 32–47 | Punctuation | !, ", #, $, %, & |
| 48–57 | Digits | 0 to 9 |
| 65–90 | Uppercase Letters | A to Z |
| 97–122 | Lowercase Letters | a to z |
| 127 | Delete | (DEL) |
2. Control Characters
| Code | Name | Description |
|---|
| 0 | NUL | Null |
| 7 | BEL | Bell (alert) |
| 8 | BS | Backspace |
| 9 | TAB | Horizontal Tab |
| 10 | LF | Line Feed (newline) |
| 13 | CR | Carriage Return |
🔡 ASCII Code Examples
Character: A
ASCII Decimal: 65
ASCII Binary: 01000001
ASCII Hex: 41
Character: 1
ASCII Decimal: 49
ASCII Binary: 00110001
ASCII Hex: 31
💡 Helpful Tips
- ASCII values are case-sensitive: 'A' ≠ 'a'
- Digits '0' to '9' start at ASCII 48
- Common functions:
ord('A') → 65chr(65) → 'A'
🛠️ Practice Exercises
- What is the ASCII value of 'Z'?
- What character does ASCII 97 represent?
- Write the ASCII values of the string "Hi!".
- What is the binary representation of 'C'?
- Match the following:
- 65 → ___
- 98 → ___
- 33 → ___
- 10 → ___
Click to see the answers, read and record.
Your file name will be PX_lastname_Practice1.mp3
Be sure to drop off your file into google classroom.
🧪 Programming Example (Python)
# Convert text to ASCII
text = "Code"
ascii_values = [ord(c) for c in text]
print(ascii_values) # Output: [67, 111, 100, 101]
# Convert ASCII to text
codes = [72, 105]
characters = ''.join([chr(code) for code in codes])
print(characters) # Output: Hi
📊 Summary Chart
| Char | Dec | Hex | Bin |
|---|
| A | 65 | 41 | 01000001 |
| B | 66 | 42 | 01000010 |
| a | 97 | 61 | 01100001 |
| 0 | 48 | 30 | 00110000 |
| ! | 33 | 21 | 00100001 |
| Space | 32 | 20 | 00100000 |
✅ Review Questions
- What is the difference between ASCII and Unicode?
- Why are ASCII values helpful in sorting text?
- How are ASCII codes used in network protocols?
Click to see the answers, read and record.
Your file name will be PX_lastname_Review1.mp3
Be sure to drop off your file into google classroom.
In summary, you will be dropping off 3 files into google classroom.
PX_lastname_ASCII.mp3
PX_lastname_Practice1.mp3
PX_lastname_Review1.mp3