ego.istic.org

One day, a teacher was checking on a novice, and saw that he was stepping through code in a debugger.

“Why are you stepping through your program?” asked the teacher.

“To check that my program executes in the way I expect,” answered the novice.

“You have compiled with compiler optimizations turned off?”

“Of course,” the novice snapped.

“Then the thing you are stepping through is not your program.”