1 files changed, 46 insertions, 0 deletions
diff --git a/src/section-9/Number.java b/src/section-9/Number.java
new file mode 100644
index 0000000..d96274f
--- /dev/null
+++ b/src/section-9/Number.java
@@ -0,0 +1,46 @@
+package ca.mokhan.assignment1;
+
+import java.util.ArrayList;
+
+public class Number {
+  public static boolean isDivisibleBy5(int n) {
+    return isDivisibleBy(n, 5);
+  }
+
+  public static boolean isDivisibleBy7(int n) {
+    return isDivisibleBy(n, 7);
+  }
+
+  public static boolean isOdd(int n) {
+    return !isDivisibleBy(n, 2);
+  }
+
+  public static boolean isPrime(int n) {
+    if (n <= 1) return false;
+
+    for (int i = n - 1; i > 1; i--) if (isDivisibleBy(n, i)) return false;
+
+    return true;
+  }
+
+  public static boolean isDivisibleBy(int n, int denominator) {
+    return n % denominator == 0;
+  }
+
+  public static ArrayList<String> iterate() {
+    ArrayList<String> items = new ArrayList<String>();
+    ArrayList<String> row = new ArrayList<String>();
+    for (Integer i = 0; i < 113; i++) {
+      row.clear();
+      row.add(String.format("%d", i));
+
+      if (isOdd(i)) row.add(String.format("%d is odd", i));
+      if (isDivisibleBy5(i)) row.add("hi five");
+      if (isDivisibleBy7(i + (i + 1))) row.add("wow");
+      if (isPrime(i)) row.add("prime");
+
+      items.add(String.join(",", row));
+    }
+    return items;
+  }
+}