RosettaCodeData/Task/Letter-frequency/OxygenBasic/letter-frequency.basic

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indexbase 0
sys a,e,i,c[255]
string s=getfile "t.txt"
e=len s
for i=1 to e
a=asc(s,i)
++c(a)
next
cr=chr(13)+chr(10)
pr="Char Frequencies" cr cr
for i=32 to 255
pr+=chr(i) chr(9) c(i) cr
next
print pr
'putfile "CharCount.txt",pr