Touble with Arrays and If's... making hangman

[helpmeagain]

Hi I need help on my program, I'm making hangman and i can't figure out how to track if the letter is not part of the word...
Heres the code: the bolded stuff is the part i need help on

var file_contents : flexible array 1 .. 0 of string
var stream : int
var geuss : string
var xx, font : int
font := Font.New ("Arial:14")

open : stream, "words.txt", get
loop
exit when eof (stream)
new file_contents, upper (file_contents) + 1
get : stream, file_contents (upper (file_contents))
end loop
var word : int
randomize
randint (word, 1, 6)
var letter : array 1 .. length (file_contents (word)) of string
var xbound : int
xbound := 20
var location : array 1 .. length (file_contents (word)) of int
for xy : 1 .. length (file_contents (word))
letter (xy) := (file_contents (word) (xy .. xy))
xbound := xbound + 20
location (xy) := 80 + xbound
Draw.FillBox (location (xy), 100, location (xy) + 10, 102, black)
end for
var finish, wrong : int
finish := 0
wrong := 0
xx := 20
loop
Text.Locate (1, 1)
put "geuss a letter"
get geuss
for x : 1 .. length (file_contents (word))
if geuss = letter (x) then
finish := finish + 1
put "ayaya"
locatexy (50, 50)
Draw.Text (letter (x), location (x), 105, font, green)
end if
if finish = (upper (letter)) then
put "You have won!You have won!"
exit when finish = (upper (letter))
end if
end for
for x : 1 .. length (file_contents (word))
if geuss ~= letter (x)then
xx := xx + 20
Draw.Text (geuss, 300 + xx, 50, font, red)
wrong := wrong + 1
end if
end for
exit when finish = (upper (letter))
end loop

the bolded part is my statement used to detect wether it is correct. If its not correct its supposed to put the incorrect letter on the screen so you know you've already geussed it. The problem is if the word is apple when you geuss a a is equal to a but not to p p l or e and so it puts on the screen that you geussed it wrong and that its right, but i want to take the geuss wrong out if its right.

[TheGuardian001]

the easiest way to check if a letter is in a string is using the index command. index returns the position of a letter in a string. if the character can't be found in that string, it returns 0.

code:

if index("guess",answer) = 0 then %if the letter is not in the word     do this elsif index("guess",answer) > 0 then % if the letter is in the answer     do this end if

hope that helps you out.

[syntax_error]

I forget in Turing if they take string as an array of char or as an object, but you have to simple check for 1 char not the whole word. So, break your word up into an array of char and just make a condition for one match to happen and then the whole statement becomes true?