Презентация на тему: Questions for discussion : How is the information encoded in the computer? Give                  1/18
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Questions for discussion : How is the information encoded in the computer? Give examples from life in which there are two states. How many bits are needed to encode traffic light status information ? Determine how many bytes the word " Goding schemes"

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Слайд 2: Coding schemes

describe standard coding systems for coding character data (ASCII, Unicode ).

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Слайд 3: Expected results (Success criteria)

know and understand the purpose of the coding system (ASCII, Unicode ); know and understand the advantages and disadvantages of coding systems ; Expected results (Success criteria)

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Character coding schemes use binary patterns to represent character data (text ). A common code in all computers ensures that information can easily be transferred between machines. Coding schemes

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ASCII

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ASCII normally uses 8 bits (1 byte) to store each character. ASCII values can take many forms: Numbers Letters (capitals and lower case are separate) Punctuation (?/|\£\$ etc.) non-printing commands (enter, escape, F1) ASCII Coding schemes

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http://foxtools.ru/Unicode The symbols are represented by 16 pieces per line. From the top you can see a hexadecimal number from 0 to 16. On the left are similar numbers in hexadecimal form from 0 to FFF. By connecting the number on the left with the number on top, you can find out the symbol code. For example: the English letter F is located on line 004, in the column 6: 004 + 6 = symbol code 0046. Unicode

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There are several versions of unicode, each with using a different number of bits to store data:

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What do you think is the encoding system used in our computers ? Why ? Explain your answer Advantages and disadvantages of coding systems

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Fixed point numbers understand how binary can be used to represent negative and fractional numbers using floating and fixed point.

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Слайд 12: Expected results (Success criteria)

are able to convert negative numbers from decimal to binary system and back ; are able to convert fractional numbers with a fixed point from decimal to binary system and back; Expected results (Success criteria)

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Questions for discussion: How are whole decimal numbers converted to a binary number system ? How are binary numbers translated into the decimal system ? How do you think, how can you translate negative numbers ?

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Signed binary numbers 0 000 0101 (positive ) 1 111 1011 (negative)

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Fixed point numbers

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Tasks Convert a Negative Denary Number into Binary Twos Complement - 12 Convert the following two's complement number into denary 0001 1011 Converting from denary to binary fractions 7.5 Convert these binary fractions into denary : 0111.0100 Additional tasks Converting from denary to binary fractions - 34.5 Converting from denary to binary fractions 4.5625 Convert the following two's complement number into denary 1111 1111 Convert these binary fractions into denary : 1011.1001

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Последний слайд презентации: Questions for discussion : How is the information encoded in the computer? Give

0000 1100 = +12 -> 1111 0100 = - 12 (positive number) 27 0111.1000 7.25 0010 0010 = +34 -> 1101 1110 = - 34 0100.1001 (negative number) 0000 0001 = - 1 11.5625