# Convert to and from Int24
**URL:** https://discourse.julialang.org/t/convert-to-and-from-int24/7670
**Category:** General Usage
**Tags:** question
**Created:** [December 10, 2017, 10:39am UTC](https://discourse.julialang.org/t/convert-to-and-from-int24/7670 "2017-12-10T10:39:08Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)
#### Post date: [December 10, 2017, 10:39am UTC](https://discourse.julialang.org/t/convert-to-and-from-int24/7670/1 "2017-12-10T10:39:08Z")
I am want to try an `Int24` type, purely for storage. It is easy to declare one with
```julia
primitive type Int24 <: Signed 24 end
```
but I am not sure how to access its value.
I only need conversion to and from `Int32`, but I don’t think I can use `reinterpret` because they don’t have the same number of bits. How can I convert to and from `Int32`?
(BTW, I am aware that I destroy alignment and it will degrade performance; it is an experiment)
---
### Author:  [@mauro3](https://discourse.julialang.org/u/mauro3)
#### Post date: [December 10, 2017, 10:59am UTC](https://discourse.julialang.org/t/convert-to-and-from-int24/7670/2 "2017-12-10T10:59:02Z")
Once you find out, it would be great to update the docs with an example like this (or a simpler one).
---
### Author:  [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)
#### Post date: [December 10, 2017, 11:12am UTC](https://discourse.julialang.org/t/convert-to-and-from-int24/7670/3 "2017-12-10T11:12:29Z")
There is an example in [test/intrinsics.jl](https://github.com/JuliaLang/julia/blob/40e7d29f981749f28034bc8dd87645d2a7188f9c/test/intrinsics.jl#L38-L40):
```julia
primitive type Int24 24 end
Int24(x::Int) = Core.Intrinsics.trunc_int(Int24, x)
Int(x::Int24) = Core.Intrinsics.zext_int(Int, x)
```
which actually solves my problem, but it may not be general enough to add to the manual.
---
### Author:  [@StefanKarpinski](https://discourse.julialang.org/u/StefanKarpinski)
#### Post date: [December 10, 2017, 6:00pm UTC](https://discourse.julialang.org/t/convert-to-and-from-int24/7670/4 "2017-12-10T18:00:57Z")
It would be interesting to see how well LLVM supports this these days. Once upon a time, “strange” bit sizes were very poorly supported but it may have gotten better.