double
     log(double x);

     long double
     logl(long double x);

     float
     logf(float x);

     double
     log2(double x);

     long double
     log2l(long double x);

     float
     log2f(float x);

     double
     log10(double x);

     long double
     log10l(long double x);

     float
     log10f(float x);

     double
     log1p(double x);

     long double
     log1pl(long double x);

     float
     log1pf(float x);

DESCRIPTION

     The log() function computes the value of the natural logarithm of argu-
     ment x.

     The log2() function computes the value of the logarithm of argument x to
     base 2.

     The log10() function computes the value of the logarithm of argument x to
     base 10.

     The log1p() function computes the value of log(1+x) accurately even for
     very small values of x.

SPECIAL VALUES

     log(+-0) , log2(+-0) , and log10(+-0) return -infinity and raise the
     log1p(x) returns a NaN and raises the "invalid" floating-point exception
     for x < -1.

     log1p(+infinity) returns +infinity.

SEE ALSO

     math(3), exp(3), exp2(3), expm1(3), pow(3)

STANDARDS

     The log() , log2() , log10() , and log1p() functions conform to ISO/IEC
     9899:1999(E).

4th Berkeley Distribution        July 2, 2003        4th Berkeley Distribution