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9.86 EPSILON — Epsilon function

Description:
EPSILON(X) returns the smallest number E of the same kind as X such that 1 + E > 1.
Standard:
Fortran 95 and later
Class:
Inquiry function
Syntax:
RESULT = EPSILON(X)
Arguments:

X The type shall be REAL.

Return value:
The return value is of same type as the argument.
Example:
          program test_epsilon
              real :: x = 3.143
              real(8) :: y = 2.33
              print *, EPSILON(x)
              print *, EPSILON(y)
          end program test_epsilon