issue #26 Caesar Cipher java

sowon-dev · sowon-dev · commit 46ab96f43afe · 2021-03-01T04:14:52.000+09:00
diff --git a/src/hackerrank/CaesarCipher.java b/src/hackerrank/CaesarCipher.java
@@ -0,0 +1,32 @@
+package hackerrank;
+
+public class CaesarCipher {
+
+  static String caesarCipher(String s, int k) {
+
+    StringBuffer result = new StringBuffer();
+
+    for (int i = 0; i < s.length(); i++) {
+        //대문자
+      if (Character.isUpperCase(s.charAt(i))) {
+        char ch = (char) (((int) s.charAt(i) + k - 65) % 26 + 65);
+        result.append(ch);
+        //소문자
+      } else if(Character.isLowerCase(s.charAt(i))) {
+        char ch = (char) (((int) s.charAt(i) + k - 97) % 26 + 97);
+        result.append(ch);
+        //기타 특수문자등
+      } else {
+        result.append(s.charAt(i));
+      }
+    }
+    return result.toString();
+  }
+
+  public static void main(String[] args) {
+    System.out.println(caesarCipher("a-z", 2) + ", ans: c-b");
+    //System.out.println(caesarCipher("middle-Outz", 2) + ", ans: okffng-Qwvb");
+    //System.out.println(caesarCipher("Hello_World!", 4) + ", ans: Lipps_Asvph!");
+    //System.out.println(caesarCipher("www.abc.xy", 87) + ", ans: fff.jkl.gh");
+  }
+}
