The rational class updated.

src/main/java/Rational/Rational.java

@@ -82,7 +82,13 @@ public class Rational {
     }
 
     //TODO
-    public static Rational divide(Rational r1, Rational r2) {return r1.divide(r2);}
+    public static Rational divide(Rational r1, Rational r2) {
+        if (r2.numerator == 0) {
+            System.out.println("You can't divide a number by zero!");
+            return null;
+        }
+        return r1.divide(r2);
+    }
 
     //  PROVIDED - String representation
     @Override