Encoding Schemes and Number System - NCERT

INTRODUCTIONHave you ever thought how the keys on the computer keyboard that are in human recognisable form are interpreted by the computer System ? This section briefly discusses text interpretation by the computer. We have learnt in the previous chapter that computer understands only binary language of 0s and 1s. Therefore, when a key on the keyboard is pressed, it is internally mapped to a unique code, which is further converted to When the key A is pressed (Figure ), it is internally mapped to a decimal value 65 (code value), which is then converted to its equivalent binary value for the computer to : Encoding of data entered using keyboardSimilarly, when we press alphabet on hindi keyboard, internally it is mapped to a hexadecimal value 0905, whose binary equivalent is what is Encoding ?

fraction part of the number has position number –1, which decreases by 1 while reading fraction part from left to right. Each symbol in a number has a positional value, which is computed using its position value and the base value of the number system. The symbol at position number 3 in a decimal system with base 10 has positional value 103 ...

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