ZX Computings - OpenLibra

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ZX80 Programs
AREA CALCULATOR
The following program, produced
for the ZX80 and using only the
1K of RAM, will calculate the area
within a polygon. The computer
plot* the point! whose co-ordinates
have been entered, using a 36
symbol code, and the area is
primed underneath. The sign of
the area will be positive if traced
anticlockwise and negative If all,
or any, of the figure is plotted
clockwise. On the display the
plotted points are displayed in the
same code as the axes and are
numbered according to the order
of entry.
In the entry stage of line 80 and
90, inputs of greater value than 32
and 21 respectively will not be
displayed although the area is
still calculated. All the input
co-ordinates are repeated after
entry tor checking, NEWLINE will
cause the program to continue if
they are correct.
10 PRINT "HOW MANY VERTICES'" 220 FOR O 0 TO V t
20 INPUT V 230 lFY-Y(OIANDX X(0) 1 HEN GOTO 270
X CLS 240 NEXT Q
40 PRINT "GIVE CO ORDINATES" 250 PRINT "
50 DIM X(V-l) 260 GOTO 280
60 DIM YIV1I 270 PRINT CHRSIQ + 1561.
70 FOR N = 0 TO V 1 280 NEXT X
80 INPUT XIN) 290 PRINT
90 INPUT YIN) 300 NEXT N
100 PRINT "r,X(N);".",Y(N),"l" 310 FORN 0 10 31
110 NEXT N 320 PRINT CHR$! 156 * Nl,
120 INPUT AS 330 NEXT N
130 CLS 340 LET Z = 0
140 FOR N = 1 TO 20 350 FOR R ~ 0 TO V 1
150 LET Y e 21N 360 LET S - R + 1 - ((R + ll/vrv
160 PRINT CHRS( 156 + Y) 370 LET TsR+2-HR + 2I/V)*V
170 FOR P = OTO V-1 380 LET Z - Z + XlSl'IYlT) Yav«
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