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Showing content from https://cplusplus.com/reference/cmath/log/ below:

function

<cmath> <ctgmath>

     double log  (     double x);      float logf (      float x);long double logl (long double x);

     double log (     double x);      float log (      float x);long double log (long double x);

     double log (double x);      float log (float x);long double log (long double x);     double log (T x);           // additional overloads for integral types

Compute natural logarithm

The natural logarithm is the base-e logarithm: the inverse of the natural exponential function (exp). For common (base-10) logarithms, see log10.

Header

provides a type-generic macro version of this function.

x

Value whose logarithm is calculated.
If the argument is negative, a domain error occurs.

If a

occurs, the global variable

is set to

.

If a

occurs, the global variable

is set

.

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/* log example */
#include <stdio.h>      /* printf */
#include <math.h>       /* log */

int main ()
{
  double param, result;
  param = 5.5;
  result = log (param);
  printf ("log(%f) = %f\n", param, result );
  return 0;
}

log10

Compute common logarithm (function)

exp

Compute exponential function (function)

pow

Raise to power (function)

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