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### 8.154 `LOG10` — Base 10 logarithm function

Description:
  `LOG10(X)` computes the base 10 logarithm of X.
Standard:
  Fortran 77 and later
Class:
  Elemental function
Syntax:
  `RESULT = LOG10(X)`
Arguments:

  X | The type shall be `REAL`.

Return value:
  The return value is of type `REAL` or `COMPLEX`. The kind type parameter is the same as X.
Example:

                program test_log10
                  real(8) :: x = 10.0_8
                  x = log10(x)
                end program test_log10

Specific names:

  Name | Argument | Return type | Standard
  `ALOG10(X)` | `REAL(4) X` | `REAL(4)` | Fortran 95 and later
  `DLOG10(X)` | `REAL(8) X` | `REAL(8)` | Fortran 95 and later