The only time I have ever seen the , operator used outside a for loop was to perform an assingment in a ternary statement. It was a long time ago so I cannot remeber the exact statement but it was something like:
int ans = isRunning() ? total += 10, newAnswer(total) : 0;
Obviously no sane person would write code like this, but the author was an evil genius who construct c statements based on the assembler code they generated, not readability. For instance he sometimes used loops instead of if statements because he preferred the assembler it generated.
His code was very fast but unmaintainable, I am glad I don't have to work with it any more.
