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BASIC Source File  |  1993-01-29  |  1.0 KB  |  37 lines
  1. '   +----------------------------------------------------------------------+
  2. '   |                                                                      |
  3. '   |        BASWIZ  Copyright (c) 1990-1993  Thomas G. Hanlin III         |
  4. '   |                                                                      |
  5. '   |                      The BASIC Wizard's Library                      |
  6. '   |                                                                      |
  7. '   +----------------------------------------------------------------------+
  8.  
  9.    DECLARE FUNCTION PiD# ()
  10.  
  11.    DEFDBL A-Z
  12.  
  13. FUNCTION ArcSinD# (Nr AS DOUBLE)
  14.    IF Nr < 0# THEN
  15.       N = -Nr
  16.       Negate% = -1
  17.    ELSE
  18.       N = Nr
  19.    END IF
  20.    IF N > 1 THEN
  21.       tmp = 99999#
  22.       Negate% = 0
  23.    ELSE
  24.       tmp = SQR(1# - N * N)
  25.       IF N > 0.7# THEN
  26.          tmp = PiD# / 2# - ATN(CDBL(tmp / N))
  27.       ELSE
  28.          tmp = ATN(CDBL(N / tmp))
  29.       END IF
  30.    END IF
  31.    IF Negate% THEN
  32.       ArcSinD# = -tmp
  33.    ELSE
  34.       ArcSinD# = tmp
  35.    END IF
  36. END FUNCTION
  37.