# FAQ: Variables: Lesson - Float and Double, What's the Difference?

This community-built FAQ covers the “Float and Double, What’s the Difference?” exercise from the lesson “Variables: Lesson”.

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I’ve been under the impression that since `float` and `double` both utilize floating-point arithmetic, it should not be used for things that require extreme mathematical precision, such as in finance. For example, one would use `BigDecimal` instead of `double` for Java. Is this still the case in C?

I suppose it depends on exactly what you’re doing but if the accuracy was important enough to have an effect in Java then the same issues would persist in C for sure. I don’t think there’s a built-in option like that for C, you’d probably have to look for a library for it, e.g. List of arbitrary-precision arithmetic software - Wikipedia but I’d happily be proven wrong if I’ve overlooked one.

For anyone who’s unfamiliar with the potential issues of using floating point the link below discusses it briefly but you’ll find plenty of guidance with a quick web search-

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