> This is not undefined behavior, it's one of the first things you learn about C after encountering the pre/postfix operators IF you pay attention to the detail

> This is not undefined behavior, it's one of the first things you learn about C after encountering the pre/postfix operators IF you pay attention to the details, which, with C, you should know to do. What exactly is not undefined behavior? The post describes a statement where a variable is modified multiple times between sequence points. What does the standard say about this? N1256, 6.5 says Between the previous and next sequence point an object shall have its stored value modified at most once by the valuation of an expression. J.2 Undefined behavior The behavior is undefined in the following circumstances: [..] * Between two sequence points, an object is modified more than once, or is modified and the prior value is read other than to determine the value to be stored (6.5). What's with the know-it-all voice?