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# Representing text

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### Representing text

1. 1. Representing Text as binary number<br />GCSE Computing Theory<br />Hello World<br />%^£&\$£%\$**<br />
2. 2. Get your brains logged on!<br />Here is a message in binary. How do you think you go about deciphering it?<br />0110100001100101011011000110110001101111001000000111011101101111011100100110110001100100<br />
3. 3. Get your brains logged on!<br />01101000<br />01100101<br />01101100<br />01101100<br />01101111<br />00100000<br />01110111<br />01101111<br />01110010<br />01101100<br />01100100<br />
4. 4. Get your brains logged on!<br />01101000<br />01100101<br />01101100<br />01101100<br />01101111<br />00100000<br />01110111<br />01101111<br />01110010<br />01101100<br />01100100<br />
5. 5. By the end of this lesson:<br />Allof you will be able to explain how binarycodes are used to represent characters<br />Most of you will be able to explain the term character set<br />A few of you will be able to describe with examples (for example ASCII and Unicode) the relationship between the number of bits per character in a character set and the number of characters which can be represented.<br />
6. 6. ASCII<br />Computers use the ASCII (American Standard Code for Information Interchange) format to use binary codes to represent numbers, letters and special characters.<br />It uses 8-bits (byte) to represent each character, so every character has it’s own unique 8-bit ASCII code.<br />
7. 7. ASCII<br />0100 1001<br />0111 0011<br />0110 0001<br />0110 1101<br />0110 0010<br />0110 0001<br />0111 0010<br />0110 0100<br />Convert the following bytes into characters using the ASCII character set.<br />
8. 8. Think…<br />How many characters can an 8-bit ASCII character set represent?<br />