SLATEC Routines --- ZSQRT ---

*DECK ZSQRT
      SUBROUTINE ZSQRT (AR, AI, BR, BI)
C***BEGIN PROLOGUE  ZSQRT
C***SUBSIDIARY
C***PURPOSE  Subsidiary to ZBESH, ZBESI, ZBESJ, ZBESK, ZBESY, ZAIRY and
C            ZBIRY
C***LIBRARY   SLATEC
C***TYPE      ALL (ZSQRT-A)
C***AUTHOR  Amos, D. E., (SNL)
C***DESCRIPTION
C
C     DOUBLE PRECISION COMPLEX SQUARE ROOT, B=CSQRT(A)
C
C***SEE ALSO  ZAIRY, ZBESH, ZBESI, ZBESJ, ZBESK, ZBESY, ZBIRY
C***ROUTINES CALLED  ZABS
C***REVISION HISTORY  (YYMMDD)
C   830501  DATE WRITTEN
C   910415  Prologue converted to Version 4.0 format.  (BAB)
C***END PROLOGUE  ZSQRT