title: Advantages/Disadvantages of using methods of class without instantiating
body: <p>In c++ we can calls method of a class without instantiating it. Such as;</p>
  
  <pre><code>MyClass mc;
  mc.method();
  </code></pre>
  
  <p>what are the advantages &amp; disadvantages of using methods of class without instantiating it? When  should we use this type? </p>