Lexical Elements

Identifiers: 255 characters are significant in internal and external names.

Character Constants: Any character constant of more than one character produces a warning. The value of an integral character constant containing more than one character is computed by concatenating the 8-bit ASCII code values of the characters, with the leftmost character being the most significant. For example, the character constant 'AB' has the value 256*'A'+'B' = 256*65+66 = 16706. Only the rightmost four characters participate in the computation.

The case of alphabetic characters is always significant in external names.

The execution character set and the source character set are both ASCII.

Nonprinting characters in character constants and string literals must be represented as escape sequences.