abs(3F)

NAME
     abs, iabs, dabs, qabs, cabs, zabs, cqabs, iiabs, jiabs - FORTRAN absolute
     value

SYNOPSIS
     integer i1, i2
     real r1, r2
     double precision dp1, dp2
     real*16 qp1, qp2
     complex cx1, cx2
     double complex dx1, dx2
     complex*32 qx1, qx2
     integer*2 ii1, ii2
     integer*4 ji1, ji2

     r2 = abs(r1)

     i2 = iabs(i1)
     i2 = abs(i1)

     dp2 = dabs(dp1)
     dp2 = abs(dp1)

     qp2 = qabs(qp1)
     qp2 = abs(qp1)

     cx2 = cabs(cx1)
     cx2 = abs(cx1)

     dx2 = zabs(dx1)
     dx2 = abs(dx1)

     qx2 = cqabs(qx1)
     qx2 = abs(qx1)

     ii2 = iiabs(ii1)
     ii2 = abs(ii1)

     ji2 = jiabs(ji1)
     ji2 = abs(ji1)

DESCRIPTION
     abs is the family of absolute value functions.  iabs returns the integer
     absolute value of its integer argument.  It accepts either integer*2 or
     integer*4 arguments and the result is the same type.  dabs returns the
     double-precision absolute value of its double-precision argument.  qabs
     returns the real*16 absolute value of its real*16 argument.  cabs returns
     the complex absolute value of its complex argument.  zabs returns the
     double-complex absolute value of its double-complex argument.  cqabs
     returns the complex*32 absolute value of its complex*32 argument.  iiabs
     returns the integer*2 absolute value of its integer*2 argument.  jiabs
     returns the integer*4 absolute value of its integer*4 argument.  The
     generic form abs returns the type of its argument.

SEE ALSO
     floor(3M).

CAVEAT
     In two's-complement integer (integer*2 or integer*4) representation the
     absolute value of the negative integer with largest magnitude is
     undefined.  Some implementations trap this error, but others simply
     ignore it.