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1990-08-22
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612b
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17 lines
10 *Tenner(N,&A(),&Leng,&F)
20 ' Tenner"s algorithm for the continued fraction of n^(1/2).
25 ' Returns leng = -1 for error.
30 ' Modeled on the Pascal version.
40 ' 4 May 1990
50 local Ub%=200,U,Uu,V,Vv,Sqn
60 if N<1 then Leng=-1:return endif
70 F=1:Leng=0:Sqn=isqrt(N):A(0)=Sqn
80 U=N-Sqn*Sqn:if U=0 then return endif
100 V=Sqn:Vv=V:Uu=U
110 repeat
120 inc Leng:if Leng>Ub% then dec Leng:F=0:return endif
140 A(Leng)=(Sqn+V)\U:V=U*A(Leng)-V
150 U=(N-V*V)\U
160 until and{V=Vv,U=Uu}
170 return ' End of subroutine Tenner.