I saw that when using parse
for example, you can do this: parse(Int, "123")
(Int
exists), but I can't do parse(Float, "12.3")
(Float
doesn't exist).
Why doesn't Float
exist as well then? What is the difference between Int
and for example Int64
or some other number after Int
anyways (I know it has to do with the size, but how can you know when to use which)?
The reason for this is that machines are either 32 bit or 64 bit. This is the size of pointers on these machines, and since pointers are just integers in hardware, it is also the "natural" integer size. Floating point arithmetic is different. (Almost) all computers have both FLoat32 and Float64, and the choice needs to be made based on application (how much range and accuracy you need). That said, you could always define const Float = Float64
and then just use Float
.
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