Which range of decimal digits does BCD use to represent values?

Binary-Coded Decimal (BCD) is a method of representing decimal numbers in a binary format, where each digit of a decimal number is represented by its own binary sequence. In BCD, each of the decimal digits from 0 to 9 is encoded in a four-bit binary number. For example, the decimal number 5 is represented in BCD as 0101, and the number 9 is represented as 1001.

This means that BCD can represent any decimal digit from 0 through 9, making the range of valid digits for BCD specifically from 0 to 9. This distinction is crucial as BCD is designed to align closely with human-readable decimal systems, aiding in applications where precise decimal representation is needed, such as in calculators and digital clocks.

Other ranges mentioned, such as 0-5 or 1-10, do not accurately describe the complete set of decimal digits that BCD can represent, further confirming the accuracy of identifying the range as 0-9.