I disagree. If you have to understand the cause of undersires behaivor before a bug can be said to exist, then debugging is a prerequisite to a bug existing. I

I disagree. If you have to understand the cause of undersires behaivor before a bug can be said to exist, then debugging is a prerequisite to a bug existing. If I write a program that computes 2+2 and it tells me the answer is 5, that’s a bug. Why is irrelevant until I want to fix it.