Fortran Wiki


aint(a [, kind]) truncates its argument to a whole number.


FORTRAN 77 and later


Elemental function


result = aint(a [, kind])


  • a - the type of the argument shall be real.
  • kind - (optional) an integer initialization expression indicating the kind parameter of the result.

Return value

The return value is of type real with the kind type parameter of the argument if the optional kind is absent; otherwise, the kind type parameter will be given by kind. If the magnitude of x is less than one, aint(x) returns zero. If the magnitude is equal to or greater than one then it returns the largest whole number that does not exceed its magnitude. The sign is the same as the sign of x.


program test_aint
  real(4) x4
  real(8) x8
  x4 = 1.234E0_4
  x8 = 4.321_8
  print *, aint(x4), dint(x8)
  x8 = aint(x4,8)
end program test_aint

category: intrinsics