Digital Electronics
The codes in which each successive code word differs from the preceding one in only one bit position are called

 self-complementing codes
 BCD codes
 sequential codes
 cyclic codes

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Digital Electronics
ASCII

 has 128 characters including control characters
 is used only in western countries
 is a subset of 8-bit EBCDIC
 is version II of the ASC standard

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Digital Electronics
2421 code is

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

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