DIM - The GNU Fortran Compiler
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### 8.65 `DIM` — Positive difference

Description:
  `DIM(X,Y)` returns the difference `X-Y` if the result is positive; otherwise returns zero.
Standard:
  Fortran 77 and later
Class:
  Elemental function
Syntax:
  `RESULT = DIM(X, Y)`
Arguments:

  X | The type shall be `INTEGER` or `REAL`
  Y | The type shall be the same type and kind as X.

Return value:
  The return value is of type `INTEGER` or `REAL`.
Example:

                program test_dim
                    integer :: i
                    real(8) :: x
                    i = dim(4, 15)
                    x = dim(4.345_8, 2.111_8)
                    print *, i
                    print *, x
                end program test_dim

Specific names:

  Name | Argument | Return type | Standard
  `DIM(X,Y)` | `REAL(4) X, Y` | `REAL(4)` | Fortran 77 and later
  `IDIM(X,Y)` | `INTEGER(4) X, Y` | `INTEGER(4)` | Fortran 77 and later
  `DDIM(X,Y)` | `REAL(8) X, Y` | `REAL(8)` | Fortran 77 and later