1.\" Copyright (c) 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" %sccs.include.redist.man% 5.\" 6.\" @(#)ldexp.3 5.1 (Berkeley) 05/02/91 7.\" 8.Dd 9.Dt LDEXP 3 10.Os 11.Sh NAME 12.Nm ldexp 13.Nd mutliply floating-point number by integral power of 2 14.Sh SYNOPSIS 15.Fd #include <math.h> 16.Ft double 17.Fn ldexp "double x" "int exp" 18.Sh DESCRIPTION 19The 20.Fn ldexp 21function multiplies a floating-point number by an integral 22power of 2. 23.Sh RETURN VALUES 24The 25.Fn ldexp 26function returns the value of 27.Fa x 28times 2 raised to the power 29.Fa exp . 30.Pp 31If the resultant value would cause an overflow, 32the global variable 33.Va errno 34is set to 35.Er ERANGE 36and the value 37.Dv HUGE 38is returned. 39.Sh SEE ALSO 40.Xr frexp 3 , 41.Xr modf 3 , 42.Xr math 3 43.Sh STANDARDS 44The 45.Fn ldexp 46function conforms 47.St -ansiC . 48