From Creatures Wikia
STOF is a CAOS command which converts between strings and floats.
Syntax: STOF str (string)
Returns the integer made from converting str. str is in the format
nn may be any length. The number following
e is the exponent. In the event of an error 0.0 is returned.
If a string of the above format begins str but something is attached to the end, the string is truncated at the end of the well-formatted portion.
The following case-insensitive special values are also accepted: "nan", "
[+|-]inf". These correspond to the obvious special float values.
This command is exactly equivalent to C's
OUTV STOF " -12.34e+5" -1234000.000000 OUTV STOF "-INF" -inf OUTV STOF "xyz" 0.000000