Digital Electronics
In signed magnitude representation, the binary equivalent of 22.5625 is (the bit before comma represents the sign)

 1,10110.1001
 0,10110.1001
 0,10110.1011
 1,10101.1001

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Digital Electronics
2421 code is

 non-weighted and non-self-complementing code
 non-weighted self-complementing code
 weighted non-self-complementing code
 weighted self-complementing code

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