1. True/False statements with OBJECT variables
If I do something like
object a,b
a="abcdefghijklmnopqrstuvwxyz"
b=gets(0)
If b=a then*
puts(1,"YAY! CORRECT!")
else
puts(1,"BAD!")
end if
*I get a message at this part of the program and it says (If b != a):
sequences arent equal in length (6 (6 chars) != 26 (26 chars))
The same thing happens when I do something like:
object a,b
a=""
while a="" do --when 'a' changes.
a=gets(0)
b=gets(0)
end while
How do I fix that???? PLEASE HELP ME.
Trivia Program Makers Are Very Ineffective If You Can't Compare String
Variables.
Thanks,
St Qu Man
2. Re: True/False statements with OBJECT variables
- Posted by MAP <ddhinc at ALA.NET>
Apr 24, 1998
ST Qu Man wrote:
>
> If I do something like
>
> object a,b
> a="abcdefghijklmnopqrstuvwxyz"
> b=gets(0)
> If b=a then*
> puts(1,"YAY! CORRECT!")
> else
> puts(1,"BAD!")
> end if
>
> *I get a message at this part of the program and it says (If b != a):
> sequences arent equal in length (6 (6 chars) != 26 (26 chars))
.
.
.
> How do I fix that???? PLEASE HELP ME.
> Trivia Program Makers Are Very Ineffective If You Can't Compare String
> Variables.
>
> Thanks,
> St Qu Man
use this instead:
if not compare(a,b) then
puts(1,"YAY! CORRECT!")
else
puts(1,"BAD!")
end if
compare() returns zero for objects that "are" equal to one another,
hence the need for the "not" in the comparison.
Hope this helps,
Christopher D. Hickman
3. Re: True/False statements with OBJECT variables
At 04:20 PM 4/24/98 -0500, you wrote:
>if not compare(a,b) then
> puts(1,"YAY! CORRECT!")
>else
> puts(1,"BAD!")
>end if
>
>compare() returns zero for objects that "are" equal to one another,
>hence the need for the "not" in the comparison.
Until you get used to this "backward" stuff, you may find
it clearer to write:
if compare(a,b) = 0 then -- think 'zero difference'
puts(1,"Same!")
else....
Irv
Spam Haiku:-------------------
Silent, former pig
One communal awareness
Myriad pink bricks
-------------------------------------
4. Re: True/False statements with OBJECT variables
>use this instead:
>if not compare(a,b) then
> puts(1,"YAY! CORRECT!")
>else
> puts(1,"BAD!")
>end if
>
>compare() returns zero for objects that "are" equal to one another,
>hence the need for the "not" in the comparison.
Also a "trim" function is useful, specially if your are using a gets(0).
Example:
function RightTrim(sequence s)
if length(s) = 0 then
return s
end if
if s[length(s)] <= 32 then
if length(s) > 1 then
return RightTrim(s[1..length(s)-1])
else
return ""
end if
else
return s
end if
end function
function LeftTrim(sequence s)
if length(s) = 0 then
return s
end if
if s[1] <= 32 then
if length(s) > 1 then
return LeftTrim(s[2..length(s)])
else
return ""
end if
else
return s
end if
end function
function AllTrim(sequence s)
return LeftTrim(RightTrim(s))
end function
if not compare(AllTrim(a),AllTrim(b)) then
puts(1,"YAY! CORRECT!")
else
puts(1,"BAD!")
end if
Regards,
Daniel Berstein.
