On the other hand, banks want numbers that actually add up properly, at least in the code that deals with money. If you use undefined behavior in C or C++, the

On the other hand, banks want numbers that actually add up properly, at least in the code that deals with money. If you use undefined behavior in C or C++, the languages do not guarantee that your bank account balances won't all be rounded down to the nearest prime number on Thursdays in odd numbered months in leap years.