vigenere - Pset2 Need help encrypting words -

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vigenere encrypting message incorrectly example if key "hello" , message hello, encrypted text "eipsv" when should "hello".

i appreciate tips on fixing bug.

    string message = getstring();     int m = strlen(message);     int = 0;        if(isalpha(message[i]))       {      for(int j = 0; j < n; i++)     {      key[j] = tolower(key[j]) - 97;      j++;        (i = 0; < m; i++)        {             char c = message[i];                if (islower(c))                 {                     c = (((c - 'a' + key[j%n])%26) +'a');                     j++;                     printf("%c", c);                 }               if (isupper (c))                     {                         c = (((c - 'a' + key[j%n])%26) +'a');                         j++;                         printf("%c", c);                         }               else if (!isupper(c) && !islower(c))                     {                      printf("%c", c);                      j++;                     }         }        }     }    printf("\n");       }

ok, handful of changes:

your first loop convert key values of 0 - 25 should in separate loop encoding loop. convert key, , move on encoding loop.

in encoding loop, need 2 incrementers, "i" , "j", both of need reinitialized 0 in ( ...;...;... ) line. can't reuse "j" key conversion loop because out of scope.

remove j++ after printf() line else if statement in encoding loop. not increment "j" if letter isn't encoded.

by way, once update program , run through check50, find several error-check errors because have error conditions check don't see in current code. but, should encode correctly above changes.


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