RosettaCodeData/Task/I-before-E-except-after-C/BBC-BASIC/i-before-e-except-after-c.b...

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F%=OPENIN"unixdict.txt"
IF F% == 0 ERROR 100, "unixdict not found!"
CI=0 : XI=0 : CE=0 : XE=0
WHILE NOT EOF#F%
Line$=GET$#F%
P%=INSTR(Line$, "ie")
WHILE P%
IF MID$(Line$, P% - 1, 1) == "c" CI+=1 ELSE XI+=1
P%=INSTR(Line$, "ie", P% + 1)
ENDWHILE
P%=INSTR(Line$, "ei")
WHILE P%
IF MID$(Line$, P% - 1, 1) == "c" CE+=1 ELSE XE+=1
P%=INSTR(Line$, "ei", P% + 1)
ENDWHILE
ENDWHILE
CLOSE#F%
PRINT "Instances of 'ie', proceeded by a 'c' = ";CI
PRINT "Instances of 'ie', NOT proceeded by a 'c' = ";XI
P1%=XI * 2 > CI
PRINT "Therefore 'I before E when not preceded by C' is" FNTest(P1%)
PRINT
PRINT "Instances of 'ei', proceeded by a 'c' = ";CE
PRINT "Instances of 'ei', NOT proceeded by a 'c' = ";XE
P2%=CE * 2 > XE
PRINT "Therefore 'E before I when preceded by C' is" FNTest(P2%)
PRINT
IF P1% AND P2% PRINT "B"; ELSE PRINT "Not b";
PRINT "oth sub-phrases are plausible, therefore the phrase " +\
\ "'I before E, except after C' can be said to be" FNTest(P1% AND P2%) "!"
END
DEF FNTest(plausible%)=MID$(" not plausible", 1 - 4 * plausible%)