EXP(S) XENIX System V EXP(S)
Name
exp, log, pow, sqrt, log10 - Performs exponential,
logarithm, power, square root functions.
Syntax
#include <math.h>
double exp (x)
double x;
double log (x)
double x;
double pow (x, y)
double x, y;
double sqrt (x)
double x;
double log10 (x)
double x;
Description
exp returns the exponential function of x.
log returns the natural logarithm of x.
pow returns xy.
sqrt returns the square root of x.
See Also
intro(S), hypot(S), sinh(S)
Diagnostics
exp and pow return a HUGE value when the correct value would
overflow. An unusually large argument may also result in
errno being set to ERANGE. log and log10 return HUGE
negative values and set errno to EDOM when x is nonpositive.
A message indicating DOMAIN error (or SING error when x is
0) is printed on the standard error output. pow returns a
huge negative value and sets errno to EDOM when x is
nonpositive and y is not an integer, or when x and y are
both zero. sqrt returns 0 and sets errno to EDOM when x is
negative. A message indicating DOMAIN error is printed on
the standard error output.
These error-handling procedures may be changed with the
function matherr(S).
Notes
These routines must be linked by using the -lm linker
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EXP(S) XENIX System V EXP(S)
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