The code where all successive numbers differ from their preceding number by single bit is __________a.Grayb.Excess 3c.BCDd.Alphanumeric Code

To determine which code has the property that all successive numbers differ from their preceding number by a single bit, let's analyze the options given:

1. Gray Code: This is a binary numeral system where two successive values differ in only one bit. This defines Gray code clearly as the candidate that meets the criterion in the question.

2. Excess-3: This is a non-weighted code used to express decimal numbers. It does not have the property of changing by a single bit.

3. BCD (Binary-Coded Decimal): This represents each decimal digit with its binary equivalent, and it does not necessarily have the property of single bit changes between successive numbers.

4. Alphanumeric Code: This generally refers to codes that represent both letters and numbers. There is no inherent property associated with single bit changes in this category.

Final Answer

The code where all successive numbers differ from their preceding number by a single bit is a. Gray Code.