Lahey/GNU Fortran

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8.229 SPACING — Smallest distance between two numbers of a given type

Description:
Determines the distance between the argument X and the nearest adjacent number of the same type.
Standard:
Fortran 95 and later
Class:
Elemental function
Syntax:
RESULT = SPACING(X)
Arguments:

X Shall be of type REAL.

Return value:
The result is of the same type as the input argument X.
Example:
          PROGRAM test_spacing
            INTEGER, PARAMETER :: SGL = SELECTED_REAL_KIND(p=6, r=37)
            INTEGER, PARAMETER :: DBL = SELECTED_REAL_KIND(p=13, r=200)
          
            WRITE(*,*) spacing(1.0_SGL)      ! "1.1920929E-07"          on i686
            WRITE(*,*) spacing(1.0_DBL)      ! "2.220446049250313E-016" on i686
          END PROGRAM
     

See also:
RRSPACING