NAME    [Toc]    [Back]

     ldexp - multiply floating-point number by integral power of 2

LIBRARY    [Toc]    [Back]

     Standard C Library (libc, -lc)

SYNOPSIS    [Toc]    [Back]

     #include <math.h>

     double
     ldexp(double x, int exp);

DESCRIPTION    [Toc]    [Back]

     The ldexp() function multiplies a floating-point number by an integral
     power of 2.

RETURN VALUES    [Toc]    [Back]

     The ldexp() function returns the value of x times 2 raised to the power
     exp.

     If the input x is a NaN, infinity, or 0.0, it is returned unchanged.

     If the result would cause an overflow, the global variable errno is set
     to ERANGE and infinity is returned, with the same sign as x.

     If the result would cause underflow to 0.0, the global variable errno is
     set to ERANGE and the value 0.0 is returned.

SEE ALSO    [Toc]    [Back]

     frexp(3), math(3), modf(3)

STANDARDS    [Toc]    [Back]

     The ldexp() function conforms to ANSI X3.159-1989 (``ANSI C'').

BSD                             August 29, 1999                            BSD