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exp(3m)								       exp(3m)

Name
       exp,  expm1,  log,  log10,  log1p,  pow, sqrt - exponential, logarithm,
       power, square root

Syntax
       #include <math.h>

       double exp(x)
       double x;

       double expm1(x)
       double x;

       double log(x)
       double x;

       double log10(x)
       double x;

       double log1p(x)
       double x;

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

       double sqrt(x)
       double x;

Description
       The function returns the exponential function of x.

       The function returns exp(x)-1 accurately even for tiny x.

       The function returns the natural logarithm of x; returns	 the  base  10
       logarithm.

       The function returns log(1+x) accurately even for tiny x.

       The function returns x raised to the y power.

       The function returns the square root of x.

Return Values
       The function returns HUGE_VAL and sets errno to ERANGE when the correct
       value would overflow.   When  the  correct  value  would	 underflow  it
       returns zero and errno is set to ERANGE.

       The function returns HUGE_VAL and sets errno to ERANGE when the correct
       value would overflow.   When  the  correct  value  would	 underflow  it
       returns -1.

       The and functions return -HUGE_VAL and set errno to EDOM when x is less
       than or equal to zero.  When the correct value would overflow flow they
       return -HUGE_VAL and errno is set to ERANGE.

       The  function  returns  -HUGE_VAL and sets errno to EDOM when x is less
       than or equal to -1.  When the correct value  would  overflow  flow  it
       returns -HUGE_VAL and errno is set to ERANGE.

       The  function  has  many	 special cases.	 When x and y are both zero it
       returns 1.0.  When x is negative and y  is  not	an  integer  value  it
       returns	zero  and errno is set to EDOM.	 When x is zero and y is nega‐
       tive it returns -HUGE_VAL and errno is set to EDOM.  When  the  correct
       value  would  overflow HUGE_VAL is returned and errno is set to ERANGE.
       When the correct value would underflow zero is returned	and  errno  is
       set to ERANGE.

       The function returns zero and sets errno to EDOM when x is negative.

Environment
       When  your  program is compiled using the System V environment, returns
       HUGE when the correct value would overflow, and sets errno  to  ERANGE;
       returns	zero when the correct value would underflow, and sets errno to
       ERANGE.

       The and functions return HUGE and set errno to EDOM when x is  nonposi‐
       tive.  An error message is printed on the standard error output.

       The function returns zero and sets errno to EDOM when x is non-positive
       and y is not an integer, or when x and  y  are  both  zero.   In	 these
       cases,  a  message  indicating  DOMAIN error is printed on the standard
       error output.  When the correct value for would overflow, returns  HUGE
       and sets errno to ERANGE.

       The function returns zero and sets errno to EDOM when x is negative.  A
       message indicating DOMAIN error is printed on the standard  error  out‐
       put.

       These error-handling procedures may be changed with the function

       DOMAIN error is only printed in the System V environment.

See Also
       hypot(3m), intro(3m), sinh(3m)

				      VAX			       exp(3m)
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