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realmax

realmax(T)

The highest finite value representable by the given floating-point DataType T.

Examples

1. Get the highest finite value of Float64:

   julia> realmax(Float64)
   1.7976931348623157e308

   This example returns the highest finite value representable by the Float64 data type.

2. Get the highest finite value of Float32:

   julia> realmax(Float32)
   3.4028235f38

   It returns the highest finite value representable by the Float32 data type.

3. Use realmax with a user-defined data type:

   julia> struct MyFloat{T} <: AbstractFloat end
   julia> Base.realmax(::Type{<:MyFloat}) = 100.0
   julia> realmax(MyFloat)
   100.0

   This example demonstrates how the realmax function can be extended for a custom user-defined floating-point data type MyFloat.

Common mistake example:

julia> realmax(Float)
ERROR: MethodError: no method matching realmax(::Type{Type{Float64}})

In this example, Float is not a concrete floating-point data type. The realmax function requires a specific floating-point data type as an argument.

See Also

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