Why doesn't this code output anything?

Question

Consider this "EXAM" question:

int main()
{
   int a=10,b=20;
   char x=1,y=0;
   if(a,b,x,y)
   {
      printf("EXAM");
   }
}

Please let me know why this doesn't print anything at all.

Answer 1

Comma operator - evaluates 1st expression and returns the second one. So a,b,x,y will return value stored in y, that is 0.