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### 8.11 `AINT` — Truncate to a whole number

Description:
  `AINT(A [, KIND])` truncates its argument to a whole number.
Standard:
  Fortran 77 and later
Class:
  Elemental function
Syntax:
  `RESULT = AINT(A [, KIND])`
Arguments:

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

Return value:
  The return value is of type `REAL` with the kind type parameter of the argument if the optional KIND is absent; otherwise, the kind type parameter will be given by KIND. If the magnitude of X is less than one, `AINT(X)` returns zero. If the magnitude is equal to or greater than one then it returns the largest whole number that does not exceed its magnitude. The sign is the same as the sign of X.
Example:

                program test_aint
                  real(4) x4
                  real(8) x8
                  x4 = 1.234E0_4
                  x8 = 4.321_8
                  print *, aint(x4), dint(x8)
                  x8 = aint(x4,8)
                end program test_aint

Specific names:

  Name | Argument | Return type | Standard
  `AINT(A)` | `REAL(4) A` | `REAL(4)` | Fortran 77 and later
  `DINT(A)` | `REAL(8) A` | `REAL(8)` | Fortran 77 and later