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 log and logl     = natural logarithm function
log10 and log10l = common logarithm function


   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);


 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


#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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