<MATH.H>

 log and logl     = natural logarithm function

log10 and log10l = common logarithm function

 Declaration:

   Real:     double log(double x);

              double log10(double x);

              long double logl(long double (x));

              long double log10l(long double (x));

  Complex:  complex log(complex x);

              complex log10(complex x);

 Remarks:

 Real versions:

 log and logl calculate the natural logarithm of x.

 log10 and log10l calculate the base 10 logarithm of x.

 Complex versions:

The complex natural logarithm is defined by

  log(z) = log(abs(z)) + i arg(z)

The complex common logarithm is defined by

  log10(z) = log(z) / log(10)

 Return Value:

   On success,

   log and logl return the natural log of x

   log10 and log10l the return log (base 10) of x

   On error,

      if x = 0, these functions set errno to ERANGE

      log and log10 return negative HUGE_VAL

       logl and log10l return negative _LHUGE_VAL

 Program

#include <math.h>

#include <stdio.h>

int main(void)

{

   double result;

   double x = 8.6872;

   result = log(x);

   printf("The natural log of %lf is %lf\n", x, result);

   return 0;

}

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