Dash Insert

ardallie · ardallie · commit 7b612741e30e · 2021-08-11T23:11:27.000+01:00
diff --git a/src/easy/DashInsert.java b/src/easy/DashInsert.java
@@ -0,0 +1,43 @@
+package easy;
+
+/**
+ * Have the function DashInsert(str) insert dashes ('-')
+ * between each two odd numbers in str. For example:
+ * if str is 454793 the output should be 4547-9-3.
+ * Don't count zero as an odd number.
+ */
+public class DashInsert {
+
+  /**
+   * Dash Insert function.
+   *
+   * @param str input string
+   * @return a string with dashes between each two odd numbers
+   */
+  private static String dashInsert(String str) {
+    StringBuilder dashed = new StringBuilder();
+    char[] chars = str.toCharArray();
+    for (int i = 1; i < chars.length + 1; i++) {
+      int c1 = Character.getNumericValue(chars[i - 1]);
+      int c2 = i < chars.length ? Character.getNumericValue(chars[i]) : 0;
+      dashed.append(c1);
+      if (c1 % 2 != 0 && c2 % 2 != 0) {
+        dashed.append("-");
+      }
+    }
+    return dashed.toString();
+  }
+
+  /**
+   * Entry point.
+   *
+   * @param args command line arguments
+   */
+  public static void main(String[] args) {
+    var result1 = dashInsert("454793");
+    System.out.println(result1);
+    var result2 = dashInsert("25928");
+    System.out.println(result2);
+  }
+
+}
