Computer Science Canada

help, attempt to read past eof
Author:  CarrieP [ Fri Jun 22, 2007 12:04 pm ]
Post subject:  help, attempt to read past eof
my problem is on line 11 (there is a datafile to go with this)




%phonebook

var wrongCount, realCount : real
var stream, count, sortBy, typeOfSort : int
var nums : string
open : stream, "phonebook.dat", get
wrongCount := 0
loop
exit when eof (stream)
get : stream, skip
get : stream, nums : *
wrongCount := wrongCount + 1
end loop
realCount := wrongCount / 5
count := ceil (realCount)
var lName, fName, street, phoneNum, streetNum : array 1 .. count of string
close : stream
open : stream, "H:/Assignments/phonebook.dat", get
for i : 1 .. count
get : stream, lName (i) : *
get : stream, fName (i) : *
get : stream, phoneNum (i) : *
get : stream, street (i) : *
get : stream, streetNum (i) : *
end for
close : stream
for i : 1 .. count
put i, " ", lName (i) : 8, " ", fName (i) : 8, " ", streetNum (i) : 4, " ", street (i) : 16, " ", phoneNum (i)
end for
put " "
%number trap for sorting
var num : string
var len, nonLettersInNum, signsOutOfPlace, decimalsInNum, nonRandCharsInNum : int
const letters := "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
const randChrs := "`~!@#$%^&*()_=[{]}|;:'<,>.?/"
const signs := "+-"
const decimal := "."
const plus := "+"
loop
nonLettersInNum := 0
signsOutOfPlace := 0
decimalsInNum := 0
nonRandCharsInNum := 0
put "What would you like to sort the list by?"
put "1. LN"
put "2. FN"
put "3. Street"
put "4. Phone #"
get num
put " "
len := length (num)
for h : 1 .. len
if index (letters, num (h)) = 0 then
nonLettersInNum := nonLettersInNum + 1
end if
if index (randChrs, num (h)) = 0 then
nonRandCharsInNum := nonRandCharsInNum + 1
end if
if index (decimal, num (h)) not= 0 then
decimalsInNum := decimalsInNum + 1
end if
end for
for h : 2 .. len
if index (signs, num (h)) not= 0 then
signsOutOfPlace := signsOutOfPlace + 1
end if
end for
exit when nonLettersInNum = len and signsOutOfPlace = 0 and decimalsInNum < 2 and nonRandCharsInNum = len and num < "5" and num > "0"
cls
put "Invalid Number"
put " "
end loop
cls
sortBy := strint (num)

loop
nonLettersInNum := 0
signsOutOfPlace := 0
decimalsInNum := 0
nonRandCharsInNum := 0
put "What sort would you like to use?"
put "1. Bubble"
put "2. Exchange"
put "3. Selection"
get num
put " "
len := length (num)
for h : 1 .. len
if index (letters, num (h)) = 0 then
nonLettersInNum := nonLettersInNum + 1
end if
if index (randChrs, num (h)) = 0 then
nonRandCharsInNum := nonRandCharsInNum + 1
end if
if index (decimal, num (h)) not= 0 then
decimalsInNum := decimalsInNum + 1
end if
end for
for h : 2 .. len
if index (signs, num (h)) not= 0 then
signsOutOfPlace := signsOutOfPlace + 1
end if
end for
exit when nonLettersInNum = len and signsOutOfPlace = 0 and decimalsInNum < 2 and nonRandCharsInNum = len and num < "4" and num > "0"
cls
put "Invalid Number"
put " "
end loop
cls
typeOfSort := strint (num)

var temp : string
if sortBy = 1 then
if typeOfSort = 1 then
%bub. sort
for i : 1 .. count
for j : 1 .. count - 1
if lName (j) > lName (j + 1) then

temp := lName (j)
lName (j) := lName (j + 1)
lName (j + 1) := temp

temp := fName (j)
fName (j) := fName (j + 1)
fName (j + 1) := temp

temp := street (j)
street (j) := street (j + 1)
street (j + 1) := temp

temp := phoneNum (j)
phoneNum (j) := phoneNum (j + 1)
phoneNum (j + 1) := temp

temp := streetNum (j)
streetNum (j) := streetNum (j + 1)
streetNum (j + 1) := temp

end if
end for
end for
%end bub
elsif typeOfSort = 2 then
%ex sort
var s : int
for i : 1 .. count - 1
s := i
for j : i .. count
if lName (j) < lName (s) then
s := j
end if
end for
%swap
temp := lName (i)
lName (i) := lName (s)
lName (s) := temp
temp := fName (i)
fName (i) := fName (s)
fName (s) := temp
temp := street (i)
street (i) := street (s)
street (s) := temp
temp := phoneNum (i)
phoneNum (i) := phoneNum (s)
phoneNum (s) := temp
temp := streetNum (i)
streetNum (i) := streetNum (s)
streetNum (s) := temp
end for
%end exchange sort
elsif typeOfSort = 3 then
%selection sort
for i : 1 .. count - 1
for j : i + 1 .. count
if lName (j) <= lName (i) then
%swap procedure (exchange of places)
temp := lName (j)
lName (j) := lName (i)
lName (i) := temp
temp := fName (j)
fName (j) := fName (i)
fName (i) := temp
temp := street (j)
street (j) := street (i)
street (i) := temp
temp := phoneNum (j)
phoneNum (j) := phoneNum (i)
phoneNum (i) := temp
temp := streetNum (j)
streetNum (j) := streetNum (i)
streetNum (i) := temp

end if
end for
end for
%end s
end if
elsif sortBy = 2 then
if typeOfSort = 1 then
%bubble sort
for i : 1 .. count
for j : 1 .. count - 1
if fName (j) > fName (j + 1) then
%swap procedure (exchange of places)
temp := lName (j)
lName (j) := lName (j + 1)
lName (j + 1) := temp
temp := fName (j)
fName (j) := fName (j + 1)
fName (j + 1) := temp
temp := street (j)
street (j) := street (j + 1)
street (j + 1) := temp
temp := phoneNum (j)
phoneNum (j) := phoneNum (j + 1)
phoneNum (j + 1) := temp
temp := streetNum (j)
streetNum (j) := streetNum (j + 1)
streetNum (j + 1) := temp
%end of swap
end if
end for
end for

elsif typeOfSort = 2 then

var s : int
for i : 1 .. count - 1
s := i
for j : i .. count
if fName (j) < fName (s) then
s := j
end if
end for
%swap
temp := lName (i)
lName (i) := lName (s)
lName (s) := temp
temp := fName (i)
fName (i) := fName (s)
fName (s) := temp
temp := street (i)
street (i) := street (s)
street (s) := temp
temp := phoneNum (i)
phoneNum (i) := phoneNum (s)
phoneNum (s) := temp
temp := streetNum (i)
streetNum (i) := streetNum (s)
streetNum (s) := temp
end for
%end exchange sort
elsif typeOfSort = 3 then
%selection sort
for i : 1 .. count - 1
for j : i + 1 .. count
if fName (j) <= fName (i) then
%swap procedure (exchange of places)
temp := lName (j)
lName (j) := lName (i)
lName (i) := temp
temp := fName (j)
fName (j) := fName (i)
fName (i) := temp
temp := street (j)
street (j) := street (i)
street (i) := temp
temp := phoneNum (j)
phoneNum (j) := phoneNum (i)
phoneNum (i) := temp
temp := streetNum (j)
streetNum (j) := streetNum (i)
streetNum (i) := temp
%end of swap
end if
end for
end for

end if
elsif sortBy = 3 then
if typeOfSort = 1 then
%bubble sort
for i : 1 .. count
for j : 1 .. count - 1
if street (j) > street (j + 1) then
%swap procedure (exchange of places)
temp := lName (j)
lName (j) := lName (j + 1)
lName (j + 1) := temp
temp := fName (j)
fName (j) := fName (j + 1)
fName (j + 1) := temp
temp := street (j)
street (j) := street (j + 1)
street (j + 1) := temp
temp := phoneNum (j)
phoneNum (j) := phoneNum (j + 1)
phoneNum (j + 1) := temp
temp := streetNum (j)
streetNum (j) := streetNum (j + 1)
streetNum (j + 1) := temp
%end of swap
end if
end for
end for
%end bubble sort
elsif typeOfSort = 2 then
%exchange sort
var s : int
for i : 1 .. count - 1
s := i
for j : i .. count
if street (j) < street (s) then
s := j
end if
end for

temp := lName (i)
lName (i) := lName (s)
lName (s) := temp
temp := fName (i)
fName (i) := fName (s)
fName (s) := temp
temp := street (i)
street (i) := street (s)
street (s) := temp
temp := phoneNum (i)
phoneNum (i) := phoneNum (s)
phoneNum (s) := temp
temp := streetNum (i)
streetNum (i) := streetNum (s)
streetNum (s) := temp
end for
%end exchange sort
elsif typeOfSort = 3 then
%selection sort
for i : 1 .. count - 1
for j : i + 1 .. count
if street (j) <= street (i) then
%swap procedure (exchange of places)
temp := lName (j)
lName (j) := lName (i)
lName (i) := temp
temp := fName (j)
fName (j) := fName (i)
fName (i) := temp
temp := street (j)
street (j) := street (i)
street (i) := temp
temp := phoneNum (j)
phoneNum (j) := phoneNum (i)
phoneNum (i) := temp
temp := streetNum (j)
streetNum (j) := streetNum (i)
streetNum (i) := temp
%end of swap
end if
end for
end for
%end selection sort
end if
elsif sortBy = 4 then
if typeOfSort = 1 then
%bubble sort
for i : 1 .. count
for j : 1 .. count - 1
if phoneNum (j) > phoneNum (j + 1) then

temp := lName (j)
lName (j) := lName (j + 1)
lName (j + 1) := temp
temp := fName (j)
fName (j) := fName (j + 1)
fName (j + 1) := temp
temp := street (j)
street (j) := street (j + 1)
street (j + 1) := temp
temp := phoneNum (j)
phoneNum (j) := phoneNum (j + 1)
phoneNum (j + 1) := temp
temp := streetNum (j)
streetNum (j) := streetNum (j + 1)
streetNum (j + 1) := temp
%end of swap
end if
end for
end for
%end bubble sort
elsif typeOfSort = 2 then
%exchange sort
var s : int
for i : 1 .. count - 1
s := i
for j : i .. count
if phoneNum (j) < phoneNum (s) then
s := j
end if
end for
%swap
temp := lName (i)
lName (i) := lName (s)
lName (s) := temp
temp := fName (i)
fName (i) := fName (s)
fName (s) := temp
temp := street (i)
street (i) := street (s)
street (s) := temp
temp := phoneNum (i)
phoneNum (i) := phoneNum (s)
phoneNum (s) := temp
temp := streetNum (i)
streetNum (i) := streetNum (s)
streetNum (s) := temp
end for
%end exchange sort
elsif typeOfSort = 3 then
%selection sort
for i : 1 .. count - 1
for j : i + 1 .. count
if phoneNum (j) <= phoneNum (i) then
%swap procedure (exchange of places)
temp := lName (j)
lName (j) := lName (i)
lName (i) := temp
temp := fName (j)
fName (j) := fName (i)
fName (i) := temp
temp := street (j)
street (j) := street (i)
street (i) := temp
temp := phoneNum (j)
phoneNum (j) := phoneNum (i)
phoneNum (i) := temp
temp := streetNum (j)
streetNum (j) := streetNum (i)
streetNum (i) := temp
%end of swap
end if
end for
end for
%end selection sort
end if
end if
for i : 1 .. count
put i, " ", lName (i) : 8, " ", fName (i) : 8, " ", streetNum (i) : 4, " ", street (i) : 16, " ", phoneNum (i)
end for
Author:  Cervantes [ Fri Jun 22, 2007 4:36 pm ]
Post subject:  RE:help, attempt to read past eof
It looks like the problem is that you're getting two lines from the file every time through your loop, but you only check for eof once. So, if your file has an odd number of lines (say 3), you'll get an error. Run through it: you open it, check if it's at eof. It's not, so you get two lines. Check if it's at eof. It's not, so you try to get two more lines, but there's only one line left. So you just read past eof.

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