title: What does it mean in C : #define ABC(a,b) {#a, a, b}
body: <p>What does it mean in C :  #define ABC(a,b) {#a, a, b} ?</p>
  
  <p>I understand that ABC is a Macro with parameters (a,b). </p>
  
  <p>But what does it mean {#a, a, b} and especially what does mean "#a" in such case?</p>