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@@ -1,32 +1,81 @@
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+import java.util.Arrays;
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+
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import static java.lang.Character.isLowerCase;
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import static java.lang.Character.isUpperCase;
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import static java.lang.Character.toLowerCase;
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+
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public class ROT13 {
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ROT13(Character cs, Character cf) {
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}
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ROT13() {
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+
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}
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public String crypt(String text) throws UnsupportedOperationException {
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- return "";
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+ return encrypt(text);
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}
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public String encrypt(String text) {
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- return text;
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+
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+ //a - z is 97 - 122
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+ //A - Z is 65 - 90
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+ // get char value of c and store it as crypto
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+ char c = 'n';
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+ char cBig = 'N';
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+ int cryptoLowerCase = (c - 97) % 26 ;
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+ int cryptoUpperCase = (cBig - 65) % 26 ;
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+
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+ char[] arr = text.toCharArray();
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+
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+ for (int i = 0; i < arr.length; i++){
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+ if (isLowerCase(arr[i])){
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+ arr[i] = (char) ((int) arr[i] + cryptoLowerCase);
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+ if (arr[i] > 'z'){
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+ arr[i] = (char) ((int) arr[i] - 26);
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+ }
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+ } else if (isUpperCase(arr[i])){
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+ arr[i] = (char) ((int) arr[i] + cryptoUpperCase);
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+ if (arr[i] > 'Z'){
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+ arr[i] = (char) ((int) arr[i] - 26);
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+ }
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+ }
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+ }
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+ String result = String.valueOf(arr);
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+ return result;
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}
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public String decrypt(String text) {
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- return text;
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+
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+ return encrypt(text);
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}
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+
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public static String rotate(String s, Character c) {
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- return "";
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+// char[] arr = s.toCharArray();
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+// int indexOfC = Arrays.asList(arr).indexOf(c);
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+//
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+// while(indexOfC > 0) {
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+// for (int i = 1; i < s.length(); i++) {
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+// char temp = arr[i];
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+// arr[i] = arr[i + 1];
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+// arr[i+1] = temp;
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+// }
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+// indexOfC--;
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+// }
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+// String result = String.valueOf(arr);
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+// return result;
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+
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+ StringBuilder sb = new StringBuilder();
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+ sb.append(s.substring(s.indexOf(c)));
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+ sb.append(s.substring(0, s.indexOf(c)));
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+ return sb.toString();
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}
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-}
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+
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+}
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