exp(3)                              CLIX                              exp(3)



  NAME

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

  LIBRARY

    Standard Math Library (libm.a)

    Intergraph Math Library (libmath.a)

    Caching Version of exp() Function (libexp_c)

  SYNOPSIS

    #include <math.h>

    double exp(
      double x );

    double log(
      double x );

    double log10(
      double x );

    double pow(
      double x ,
      double y );

    double sqrt(
      double x );

  PARAMETERS

    x   An argument of type double

    y   An argument of type double

  DESCRIPTION

    The exp() function returns ex.

    The log() function returns the natural logarithm of x.  The value of x
    must be positive.

    The log10() function returns the logarithm base ten of x.  The value of x
    must be positive.

    The pow() function returns xy.  If x is zero, y must be positive.  If x is
    negative, y must be an integer.



  2/94 - Intergraph Corporation                                              1

  exp(3)                              CLIX                              exp(3)



    The sqrt() function returns the non-negative square root of x.  The value
    of x may not be negative.

  RETURN VALUES

    The exp() function returns HUGE when the correct value would overflow, or
    0 when the correct value would underflow, and sets errno to ERANGE.

    The log() and log10() functions return -HUGE and set errno to EDOM when x
    is nonpositive.  A message indicating DOMAIN error (or SING error when x
    is 0) is displayed on stderr.

    The pow() function returns 0 and sets errno to EDOM when x is 0 and y is
    nonpositive, or when x is negative and y is not an integer.  In these
    cases a message indicating DOMAIN error is displayed on stderr.  When the
    correct value for pow() would overflow or underflow, pow() returns +HUGE
    or 0 respectively, and sets errno to ERANGE.

    The sqrt() returns 0 and sets errno to EDOM when x is negative.  A message
    indicating DOMAIN error is displayed on stderr.

    These error-handling procedures may be changed with the function
    matherr().

  ERRORS

    See the RETURN VALUES.

  RELATED INFORMATION

    Functions: hypot(3), matherr(3), sinh(3)























  2                                              Intergraph Corporation - 2/94