https://docs.oracle.com/cd/E88353_01/html/E37846/scalbnl-3m.html
scalbnl - man pages section 3: Extended Library Functions, Volume 2
scalbln , scalblnf , scalblnl , scalbn , scalbnf , scalbnl - compute exponent using FLT_RADIX
man pagesextended librarysectionfunctionsvolume