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m reference Control character rather than C0 C1(C1 is 8 bits) add 7 bit binary representations |
Fix binary representation for letter "A" and all octal representations |
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==Description==
The [[ASCII]] text-encoding standard uses 7 bits to encode characters. With this it is possible to encode 128 (i.e. 2<sup>7</sup>) unique values (0–127) to represent the alphabetic, numeric, and punctuation characters commonly used in [[English language|English]], plus a selection of [[Control character|Control characters]] which do not represent printable characters. For example, the capital letter '''A''' is represented in 7 bits as 100
In contrast, most computers store data in memory organized in eight-bit [[byte]]s. Files that contain machine-executable code and non-textual data typically contain all 256 possible eight-bit byte values. Many computer programs came to rely on this distinction between seven-bit ''text'' and eight-bit ''binary'' data, and would not function properly if non-ASCII characters appeared in data that was expected to include only ASCII text. For example, if the value of the eighth bit is not preserved, the program might interpret a byte value above 127 as a flag telling it to perform some function.
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