extra FP types in C

[Jim Thomas]

Do you know of C implementations that have real floating types other
than the langauge's float, double, and long double ones?  If so, answers
to any or all of these would be most appreciated:

What are the type names?  

What suffixes (or other scheme) are used for library functions (like
sin_, strto_)?  

What conversion specifiers are used for printf and scanf?

How many exponent and significand bits are in the representations?  1's
bit implicit or explicit?

Any other interesting characteristics? 

-Jim