Which one will execute faster, if (flag==0) or if (0==flag)?

Question

Interview question: Which one will execute faster, if (flag==0) or if (0==flag)? Why?

Answer 1

There is absolutely no difference.

You might gain points in answering that interview question by referring to the elimination of assignment/comparison typos, though:

if (flag = 0)  // typo here
   {
   // code never executes
   }

if (0 = flag) // typo and syntactic error -> compiler complains
   {
   // ...
   }

While it's true, that e.g. a C-compiler does warn in case of the former (flag = 0), there are no such warnings in PHP, Perl or Javascript or .