Here's a program I wrote in Structured Basic on my C64 computer:

 

100 REM COMPUTING PI USING RECTANGLES

110 REM DOTS REPRESENT INDENTATIONS

120 CALL INIT

140 CALL MAIN

160 CALL OUTPUT

180 END

200 :

220 PROC INIT

240 .....TI$="000000"

260 .....A=0:B=1

280 .....N=10

300 ENDPROC

320 :

340 PROC MAIN

360 .....DX=(B-A)/N

380 .....PRINT:PRINT"DX =";DX

400 .....X=-DX

420 .....I=-1

440 .....PRINT:PRINT" I ";" X ";" Y ";" T ":PRINT

460 .....LOOP

480 ........I=I+1

500 ........X=X+DX

520 ........Y=SQR(1-X*X)

540 ........T=T+Y

560 ........PRINT I;X;Y;T

580 .....UNTIL I=N-1

600 .....PI=DX*T*4

620 ENDPROC

640 :

660 PROC OUTPUT

680 .....PRINT:PRINT"PI =";PI

700 .....PRINT:PRINT"TIME TAKEN = ";TI$

720 ENDPROC

!

Moderator Note

Isaac, you already have a number of threads on calculating pi. From now on, could you please consolidate them to one thread instead of opening up others?

For reference:

http://www.sciencefo...__1#entry679038
http://www.sciencefo...__fromsearch__1
http://www.sciencefo...__fromsearch__1
http://www.sciencefo...__fromsearch__1
http://www.sciencefo...__fromsearch__1
http://www.sciencefo...__fromsearch__1
http://www.sciencefo...__fromsearch__1

There are far too many of these. I am merge the non-repeating threads into the last of these links so you can use the single thread for your ideas, etc., on calculating pi.

Thread closed.