FLOOR - The GNU Fortran Compiler
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### 8.86 `FLOOR` — Integer floor function

Description:
  `FLOOR(A)` returns the greatest integer less than or equal to X.
Standard:
  Fortran 95 and later
Class:
  Elemental function
Syntax:
  `RESULT = FLOOR(A [, KIND])`
Arguments:

  A | The type shall be `REAL`.
  KIND | (Optional) An `INTEGER` initialization expression indicating the kind parameter of the result.

Return value:
  The return value is of type `INTEGER(KIND)` if KIND is present and of default-kind `INTEGER` otherwise.
Example:

                program test_floor
                    real :: x = 63.29
                    real :: y = -63.59
                    print *, floor(x) ! returns 63
                    print *, floor(y) ! returns -64
                end program test_floor

See also:
  CEILING, NINT