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Computer Codes Rohit Khokher

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Computer Codes Data types NumericNonnumeric IntegerRealAlphabet A, B, C, …,Z a, b, c,…,z Digits 0,…,9 Special Characters +,-, /, #,$,%, ^, &, (, ),_ =,, :,;,., [,],{, }, …

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Computer Codes Any data is internally represented using bits (0 and 1) Computer codes were invented by grouping the bits to represent the data types A group consisting of n bits was called n-bit- byte. The group size is standardized to 8-bits. Now a byte means a group of 8-bits.

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BCD (Binary Coded Decimal) Code BCD Code Zone Digits Binary code A B C D E F G H I BCD Code Zone Alphabet Binary code J K L M N O P Q R BCD Code Zone Alphabet Binary code s T U V W X Y Z BCD Code Zone Alphabet Binary code

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BCD (Binary Coded Decimal) Code In BCD code digits 1 to 9 and alphabet A-Z are coded using Zone (2)bits + (Binary equivalent of digits 1 to 9) 4 bits BCD code uses 6 bits, so there are 2 6 (64) codes 9 codes for digits, 1 for 0, 26 for alphabet and 28 codes for other characters. 2 6 (64) codes are insufficient to generate codes for all the required characters.

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EBCDIC: Extended Binary Coded Decimal Interchange code EBCDIC =36 Codes But, there may be 2 8 =256 possible code A to I J to R S to Z C1 C2 C3 C4 C5 C6 C7 C8 C9 D1 D2 D3 D4 D5 D6 D7 D8 D9 E2 E3 E4 E5 E6 E7 E8 E9 F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 0 to 9 ZonesZones

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ASCII American Standard Code for Information Exchange (ASCII) ASCII-7 zone (3bits) digit (4-bits) ASCII -8 zone (4bits) digit (4-bits)

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