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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "SCALB" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" scalb 
+.SH NAME
+scalb \- load exponent of a radix-independent floating-point number
+.SH SYNOPSIS
+.LP
+\fB#include <math.h>
+.br
+.sp
+double scalb(double\fP \fIx\fP\fB, double\fP \fIn\fP\fB); \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIscalb\fP() function shall compute \fIx\fP*\fIr**n\fP, where
+\fIr\fP is the radix of the
+machine's floating-point arithmetic. When \fIr\fP is 2, \fIscalb\fP()
+shall be equivalent to \fIldexp\fP() . The value of \fIr\fP is FLT_RADIX
+which is defined in \fI<float.h>\fP.
+.LP
+An application wishing to check for error situations should set \fIerrno\fP
+to zero and call
+\fIfeclearexcept\fP(FE_ALL_EXCEPT) before calling these functions.
+On return, if \fIerrno\fP is non-zero or
+\fIfetestexcept\fP(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW)
+is non-zero, an error has occurred.
+.SH RETURN VALUE
+.LP
+Upon successful completion, the \fIscalb\fP() function shall return
+\fIx\fP*\fIr**n\fP.
+.LP
+If \fIx\fP or \fIn\fP is NaN, a NaN shall be returned.
+.LP
+If \fIn\fP is zero, \fIx\fP shall be returned.
+.LP
+If \fIx\fP is \(+-Inf and \fIn\fP is not -Inf, \fIx\fP shall be returned.
+.LP
+If \fIx\fP is \(+-0 and \fIn\fP is not +Inf, \fIx\fP shall be returned.
+.LP
+If \fIx\fP is \(+-0 and \fIn\fP is +Inf, a domain error shall occur,
+and either a NaN (if supported), or an
+implementation-defined value shall be returned.
+.LP
+If \fIx\fP is \(+-Inf and \fIn\fP is -Inf, a domain error shall occur,
+and either a NaN (if supported), or an
+implementation-defined value shall be returned.
+.LP
+If the result would cause an overflow, a range error shall occur and
+\(+-HUGE_VAL (according to the sign of \fIx\fP) shall
+be returned.
+.LP
+If the correct value would cause underflow, and is representable,
+a range error may occur and the correct value shall be
+returned.
+.LP
+If the correct value would cause underflow, and is not representable,
+a range error may occur, and 0.0 shall be returned.
+.SH ERRORS
+.LP
+The \fIscalb\fP() function shall fail if:
+.TP 7
+Domain\ Error
+If \fIx\fP is zero and \fIn\fP is +Inf, or \fIx\fP is Inf and \fIn\fP
+is -Inf. 
+.LP
+If the integer expression (math_errhandling & MATH_ERRNO) is non-zero,
+then \fIerrno\fP shall be set to [EDOM]. If the
+integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero,
+then the invalid floating-point exception shall be
+raised.
+.TP 7
+Range\ Error
+The result would overflow. 
+.LP
+If the integer expression (math_errhandling & MATH_ERRNO) is non-zero,
+then \fIerrno\fP shall be set to [ERANGE]. If the
+integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero,
+then the overflow floating-point exception shall be
+raised.
+.sp
+.LP
+The \fIscalb\fP() function may fail if:
+.TP 7
+Range\ Error
+The result underflows. 
+.LP
+If the integer expression (math_errhandling & MATH_ERRNO) is non-zero,
+then \fIerrno\fP shall be set to [ERANGE]. If the
+integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero,
+then the underflow floating-point exception shall be
+raised.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+Applications should use either \fIscalbln\fP(), \fIscalblnf\fP(),
+or \fIscalblnl\fP() in preference to
+this function.
+.LP
+IEEE\ Std\ 1003.1-2001 only defines the behavior for the \fIscalb\fP()
+function when the \fIn\fP argument is an
+integer, a NaN, or Inf. The behavior of other values for the \fIn\fP
+argument is unspecified.
+.LP
+On error, the expressions (math_errhandling & MATH_ERRNO) and (math_errhandling
+& MATH_ERREXCEPT) are independent of
+each other, but at least one of them must be non-zero.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIfeclearexcept\fP() , \fIfetestexcept\fP() , \fIilogb\fP() , \fIldexp\fP()
+, \fIlogb\fP() , \fIscalbln\fP() , the Base Definitions volume of
+IEEE\ Std\ 1003.1-2001, Section 4.18, Treatment of Error Conditions
+for Mathematical Functions, \fI<float.h>\fP, \fI<math.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .