Letter Changes

ardallie · ardallie · commit 32545f7c5544 · 2021-08-13T22:41:05.000+01:00
diff --git a/src/easy/LetterChanges.java b/src/easy/LetterChanges.java
@@ -0,0 +1,54 @@
+package easy;
+
+/**
+ * Have the function LetterChanges(str) take the str parameter
+ * being passed and modify it using the following algorithm.
+ * Replace every letter in the string with the letter
+ * following it in the alphabet (i.e. c becomes d, z becomes a).
+ * Then capitalize every vowel in this new string (a-e-i-o-u)
+ * and finally return this modified string.
+ */
+public class LetterChanges {
+
+
+  /**
+   * Letter Changes function.
+   *
+   * @param str input string
+   * @return modified string
+   */
+  private static String letterChanges(String str) {
+
+    char[] alphabet = {'b', 'c', 'd', 'E', 'f', 'g', 'h', 'I', 'j', 'k', 'l',
+        'm', 'n', 'O', 'p', 'q', 'r', 's', 't', 'U', 'v', 'w', 'x', 'y', 'z', 'A'};
+    char[] charArray = str.toLowerCase().toCharArray();
+    StringBuilder output = new StringBuilder();
+
+    for (int i = 0; i < str.length(); i++) {
+      char letter = str.charAt(i);
+      boolean isLetter = letter >= 'a' && letter <= 'z';
+      if (isLetter) {
+        output.append(alphabet[charArray[i] - 97]);
+      } else {
+        output.append(letter);
+      }
+    }
+
+    return output.toString();
+  }
+
+  /**
+   * Entry point.
+   *
+   * @param args command line arguments
+   */
+  public static void main(String[] args) {
+    var result1 = letterChanges("anthology");
+    System.out.println(result1);
+    var result2 = letterChanges("equilibrium");
+    System.out.println(result2);
+    var result3 = letterChanges("oxford");
+    System.out.println(result3);
+  }
+
+}
