# BigFloat

``````..  BigFloat(x)

Create an arbitrary precision floating point number. ``x`` may be
an ``Integer``, a ``Float64`` or a ``BigInt``. The
usual mathematical operators are defined for this type, and results
are promoted to a ``BigFloat``.

Note that because decimal literals are converted to floating point numbers
when parsed, ``BigFloat(2.1)`` may not yield what you expect. You may instead
prefer to initialize constants from strings via :func:`parse`, or using the
``big`` string literal.

.. doctest::

julia> BigFloat(2.1)
2.100000000000000088817841970012523233890533447265625000000000000000000000000000

julia> big"2.1"
2.099999999999999999999999999999999999999999999999999999999999999999999999999986``````

## Examples

The `BigFloat(x)` function in Julia is used to create an arbitrary precision floating-point number. The input `x` can be a `NaN`, an `Integer`, a `Float64`, or a `BigInt`. Mathematical operators are defined for this type, and results are promoted to a `BigFloat`.

Here are some examples of how to use the `BigFloat` function:

1. Create a `BigFloat` from an `Integer`:

``````julia> BigFloat(10)
1.000000000000000000000000000000000000000000000000000000000000000000000000000000``````
2. Create a `BigFloat` from a `Float64`:

``````julia> BigFloat(3.14)
3.140000000000000124344978758017532527446746826171875000000000000000000000000000``````
3. Create a `BigFloat` from a `BigInt`:
``````julia> BigFloat(big(123456789))
1.234567890000000000000000000000000000000000000000000000000000000000000000000000e+08``````

It's important to note that when using decimal literals, they are converted to floating-point numbers when parsed. This can result in some loss of precision. To ensure precise initialization, you can use the `parse` function or the `big` string literal.

Here is an example using `parse` to initialize from a string:

``````julia> parse(BigFloat, "2.1")
2.099999999999999999999999999999999999999999999999999999999999999999999999999999``````

And here is an example using the `big` string literal:

``````
julia> big"2.1"
2.099999999999999999999999999999999999999999999999999999999``````

## See Also

BigFloat, BigInt, Dict, eltype, fieldtype, Float32, Float64, IntSet, isa, isalnum, isalpha, isascii, iseltype, isequal, isgraph, isimmutable, isinteractive, isleaftype, isnull, ispunct, isspace, issubtype, keytype, Nullable, NullException, promote_type, typeintersect, typejoin, typemax, typemin, typeof, Val, valtype,

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