\START82\
\COMMENT=Program file dated 12/04/95, 15:54
\NAME=ELIPSE
\FILE=ELIPSE.82P
Func:FnOff 
ClrHome
Disp "(X-H)\^2\/A\^2\+"
Disp ""
Disp "(Y-K)\^2\/B\^2\ = 1"
Disp ""
Prompt H
Prompt K
Prompt A
Prompt B
"K+\sqrt\(B\^2\(1-(X-H)\^2\/A\^2\))"\->\\Y1\
"K-\sqrt\(B\^2\(1-(X-H)\^2\/A\^2\))"\->\\Y2\
10\->\S
Lbl 1
\(-)\S\->\Xmin
S\->\Xmax
\(-)\S\->\Ymin
S\->\Ymax
ZSquare
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
\STOP82\