exp(3M) — sys5



EXP(3M)         DOMAIN/IX Reference Manual (SYS5)         EXP(3M)



NAME
     exp, log, log10, pow, sqrt - exponential, logarithm, power,
     square root functions

USAGE
     #include <math.h>

     double exp (x)
     double x;

     double log (x)
     double x;

     double log10 (x)
     double x;

     double pow (x, y)
     double x, y;

     double sqrt (x)
     double x;

DESCRIPTION
                  x
     Exp returns e .

     Log returns the natural logarithm of x.  The value of x must
     be positive.

     Log10 returns the logarithm base ten of x.  The value of x
     must be positive.

                  y
     Pow returns x .  If x is zero, y must be positive.  If x is
     negative, y must be an integer.

     Sqrt returns the non-negative square root of x.  The value
     of x may not be negative.

DIAGNOSTICS
     Exp returns HUGE when the correct value would overflow, or
     zero when the correct value would underflow, and sets errno
     to ERANGE.

     Log and log10 return -HUGE and set errno to EDOM when x is
     not positive.  A message indicating `DOMAIN' error (or SING
     error when x is zero) is printed on the standard error out-
     put.

     Pow returns zero and sets errno to EDOM when x is zero and y
     is not positive, or when x is negative and y is not an
     integer.  In these cases, a message indicating `DOMAIN'
     error is printed on the standard error output.  When the
     correct value for pow would overflow or underflow, pow



Printed 5/10/85                                             EXP-1



EXP(3M)         DOMAIN/IX Reference Manual (SYS5)         EXP(3M)



     returns +HUGE or zero respectively, and sets errno to
     ERANGE.

     Sqrt returns zero and sets errno to EDOM when x is negative.
     A message indicating `DOMAIN' error is printed on the stan-
     dard error output.

RELATED INFORMATION
     hypot(3M), sinh(3M).














































EXP-2                                             Printed 5/10/85

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