On May 20, 2011, at 1:48 AM, 김태윤 wrote: > hello > I am trying to make little human like text searching program > but there's bug that I can't catch for many hours > the bug is > when text.txt file contains > explorer > and when I am trying to find > exp > then error arise > when the text.txt contains > explorers > and the time I trying to search > expl > the error > list-ref: index 9 too large for list: (#\e #\x #\p #\l #\o #\r #\e #\r #\s) > is arise on > (equal? last-char (list-ref data (+ index len -1)))) > but the wierd thing is that > when the text.txt file contains > 2explorers > and when I am trying to find > 2explorer > no error arise > but > finding 2explorers returns 0 Found
Test cases! Test cases! If you're not familiar with How To Design Program's "design recipe", I *strongly* urge you to have a look. Its authors are also the authors of DrRacket. http://www.htdp.org John Clements
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