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Rounding occurs when a real number x cannot be precisely matched to a fixed- or a floating- point representation. The result of rounding is typically either the nearest representation of x or a truncated version of x obtained by dividing and dropping the remainder. Here's an example in R:

# Round 0.333.. to a nearby floating-point
print(1 / 3, digits = 22) # print 22 digits of fp(1/3)
## 0.3333333333333333148296
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