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I am getting nuts trying to figure out why my vigenere application gives a "Segmentation fault (core dumped)" every time I try to run it (my code is there).

Can someone point out some mistakes that cause the problem?

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Found answer from facebook:

Check line 19.

isalpha() works on single characters, not whole strings.

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    you can mark this as accepted and close.
    – lethaljd
    Nov 17, 2014 at 18:44
  • I can accept my answer in 2 days is saying
    – Heraclis
    Nov 17, 2014 at 20:19

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