title: C++ add new code during runtime
body: <p>I am using C++ (in xcode and code::blocks), I don't know much.
  I want to make something compilable during runtime. </p>
  
  <p>for eg:</p>
  
  <pre><code>char prog []={"cout&lt;&lt;"helloworld " ;} 
  </code></pre>
  
  <p>It should compile the contents of prog.
  I read a bit about quines , but it didn't help me . </p>