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.

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

Standard

Fortran 95 and later

Class

Elemental function