Java rotating characters with a negative input -


we have been working on issue little while , cannot seem figure out. suggested post new question information. have method rotates characters in string encryption. user chooses amount of shift , direction of shift. direction 1 working great, direction 2 not. output direction 1 string abcd comes out bdfh want (the shift amount changes after each letter), direction 1 output abcd coming out zzzz

can tell why shift not working properly? have been working on 1 days , it's driving me mad! thank help.

overloaded methods:

public static string rotate(string userstring, int shiftvalue, int shiftdirection) {     if (shiftdirection == 1) {         return rotate(userstring, shiftvalue);     }     else if (shiftdirection == 2) {         return rotate(userstring, -shiftvalue);     }     else {         return "this not valid way shift message.";     } }  public static string rotate(string userstring, int shiftvalue) {    stringbuilder encoded = new stringbuilder();    int myshift = shiftvalue % 26 + 26;    (char : userstring.tochararray()) {        if (character.isletter(i)) {             if (character.isuppercase(i)) {                 encoded.append((char) ('a' + (i - 'a' + myshift) % 26 ));             } else {                 encoded.append((char) ('a' + (i - 'a' + myshift) % 26 ));             }         } else {             encoded.append(i);         }         myshift = (myshift + shiftvalue) % 26;     }     return encoded.tostring(); }

the irony here that, believe or not, there nothing wrong code. "abcd" should produce "zzzz" when shifted in opposite direction. see this, use "zzzz" input. shifting direction 1 produce "abcd".

to elaborate:

a shifted 1 z b shifted 2, z c shifted 3, z d shifted 4, z

enjoy :)


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