title: Comma in variable initialization/declaration
body: <p>I've stumbled upon a piece of code that look as follows:</p>
  
  <pre><code>    void check()
      {
          int integer = 7;
  
          //integer2 is not declared anywhere
          int check = integer, integer2;
  
          //after running
          //check = 7
          //integer = 7
          //integer2 = 0
      }
  </code></pre>
  
  <p>what's the purpose of the comma here?</p>