title: Quotation mark in return C++
body: <p>I get a code like this</p>
  
  <pre><code>virtual Qstring getEnergies() const {
  return "estrain"
         ",eslip"
         ",edashpot";
  }
  </code></pre>
  
  <p>Could you guys please explain the meaning of quotation and comma marks in that code? I am really thankful</p>