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9.205 NEAREST — Nearest representable number ¶

Description:

NEAREST(X, S) returns the processor-representable number nearest to X in the direction indicated by the sign of S.

Standard:

Fortran 90 and later

Class:

Elemental function

Syntax:

RESULT = NEAREST(X, S)

Arguments:

X	Shall be of type REAL.
S	Shall be of type REAL and not equal to zero.

Return value:

The return value is of the same type as X. If S is positive, NEAREST returns the processor-representable number greater than X and nearest to it. If S is negative, NEAREST returns the processor-representable number smaller than X and nearest to it.

Example:

program test_nearest
  real :: x, y
  x = nearest(42.0, 1.0)
  y = nearest(42.0, -1.0)
  write (*,"(3(G20.15))") x, y, x - y
end program test_nearest