\start83\
\comment=Program file dated 10/07/97, 14:24
\name=ELIPSE
\file=J:\ELIPSE.AS3
prgmFACSU
Disp "(X-H)\^2\/A\^2\+"
Disp ""
Disp "(Y-K)\^2\/B\^2\ = 1"
Disp ""
Prompt H
Prompt K
Prompt A
Prompt B
"K+\root\(B\^2\(1-(X-H)\^2\/A\^2\))"\->\Y\1\
"K-\root\(B\^2\(1-(X-H)\^2\/A\^2\))"\->\Y\2\
10\->\S
Lbl 1
\(-)\S\->\Xmin
S\->\Xmax
\(-)\S\->\Ymin
S\->\Ymax
DispGraph
Line(H-A,K,H+A,K)
Line(H,K+B,H,K-B)
Pause 
ClrHome
Disp "(1)ZOOM IN"
Disp "(2)ZOOM OUT"
Disp "(3)QUIT"
Disp ""
Input "ENTER 1,2,3 ",C
If C=3
Goto 5
If C=1
Then
S/2\->\S
Else
S*2\->\S
End
Goto 1
Lbl 5
ClrHome

\stop83\