title: How to re-initialize / set a integer to a value of null
body: <p>Example code:</p>
  
  <pre><code>    bool running = true;
      while (running == true) {
          int x;
          cout &lt;&lt; "Enter an integer: ";
          cin &gt;&gt; x;
          string y;
          cout &lt;&lt; "Enter a string: ";
          cin &gt;&gt; y;
          first.S_Return(x);
          first.S_Return(y);
          x=null; // null is not a recognised integer
          y=null;
          system("PAUSE");
         }
  </code></pre>
  
  <p>What I'm wondering is, </p>
  
  <p>If I wanted to re-initialize any data types to a value of null, such as when they are being declared is there any way to do this like a clear, delete, set to null method ect. Or would do I need to delcare a pointer and place them on the heap using new and delete?</p>