\start83\
\comment=Program file dated 10/07/97, 14:24
\name=SURFAREA
\file=J:\SURFAREA.AS3
prgmFACSU
Disp "ENTER FUNCTION"
Disp "( IN QUOTES )"
Disp ""
Input "Y\1\=",Y\1\

Lbl 1
ClrDraw
ClrHome
Disp "LOWER LIMIT"
Disp "OF X"
Prompt L
Disp "UPPER LIMIT"
Disp "OF X"
Prompt U
Disp "HOW MANY"
Disp "INTERVALS ?"
Prompt N
0\->\S
(U-L)/N\->\W

L\->\Xmin
U\->\Xmax
L\->\T
ClrHome
Disp "SCALING GRAPH"
Disp "PLEASE WAIT"
fMin(Y\1\,X,L,U)\->\A
fMax(Y\1\,X,L,U)\->\B
Y\1\(A)\->\Ymin
Y\1\(B)\->\Ymax
If abs((Ymin)>abs((Ymax)
Then
abs((Ymin)\->\Ymax
Else
\(-)\(Ymax)\->\Ymin
End
DispGraph
For(I,1,N)
Y\1\(T)\->\P
Y\1\(T+W)\->\Q


S+(2\pi\((P+Q)/2)\root\((W\^2\+(Q-P)\^2\))\->\S
Line(T,\(-)\P,T,P)
Line(T,P,T+W,Q)
Line(T+W,Q,T+W,\(-)\Q)
Line(T+W,\(-)\Q,T,\(-)\P)
T+W\->\T
End
Pause 
ClrHome
Disp "INTEGRAL ="
Disp S
Disp ""
Disp "RUN AGAIN ?"
Disp "(1) YES"
Disp "(2) NO"
Input R
If R=1
Goto 1
ClrHome
\stop83\