How many bits are typically used to represent an ASCII character?

• A. 5 bits
• B. 7 bits
• C. 8 bits
• D. 16 bits

Answer: (B)

The typical representation of an ASCII character uses 7 bits. ASCII, which stands for American Standard Code for Information Interchange, was designed to encode text in computers and other devices that use text. The original ASCII standard allows for 128 unique characters, which includes control characters (like the carriage return and line feed), digits, uppercase and lowercase letters, and various punctuation symbols.

With 7 bits, it is possible to represent 2^7, or 128 different values (0-127), which covers the entire range of standard ASCII characters. Although extended versions of ASCII made use of 8 bits to include additional characters (like some accented letters or additional symbols), the core ASCII set is based on the 7-bit encoding.

Understanding this foundation helps in recognizing that while modern encoding systems (like UTF-8) and character sets may use more bits for broader character representation, the original ASCII standard is rooted in the use of 7 bits.