# How to repeat the format in @printf?

**URL:** <https://discourse.julialang.org/t/how-to-repeat-the-format-in-printf/66695>\
**Category:** General Usage\
**Tags:** io\
**Created:** [August 19, 2021, 11:48pm UTC](https://discourse.julialang.org/t/how-to-repeat-the-format-in-printf/66695 "2021-08-19T23:48:58Z")\
**Posts on this page:** 1\
**Showing post:** 18

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**Author:** ![rafael.guerra](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/rafael.guerra/32/216610_2.png) [@rafael.guerra](https://discourse.julialang.org/u/rafael.guerra)\
**Post date:** [August 24, 2021, 6:38am UTC](https://discourse.julialang.org/t/how-to-repeat-the-format-in-printf/66695/18 "2021-08-24T06:38:51Z")

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@CRquantum, you can add `join`:  
(using also [join trick](https://discourse.julialang.org/t/how-to-declare-a-string-array-for-the-purpose-of-concatenation/66868/8) from @gustaphe):

```julia
a = [1.0, 2.0, 3.0, 4.0]
f = Ref(Printf.Format("%5.2f"));
open("fileout0.txt", "a") do io
    join(io, Printf.format.(f,a))
end

```

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