Extended environment enquiries (The GNU Algol 68 Compiler)

### 7.2 Extended environment enquiries ¶

An environment enquiry is a constant, whose value may be useful to the programmer, that reflects some characteristic of the particular implementation. The values of these enquiries are also determined by the architecture and operating system targeted by the compiler.

Constant: `l int` L min int ¶

  The most negative integral value.

Constant: `l real` L min real ¶

  The most negative real value.

Constant: `l real` L infinity ¶

  Positive infinity expressed in a real value.

Constant: `l real` L minus infinity ¶

  Negative infinity expressed in a real value.

Constant: `char` replacement char ¶

  A character that is unknown, unrecognizable or unrepresentable in Unicode.

Constant: `char` eof char ¶

  char value that doesn’t denote an actual char, but an end-of-file situation.