# How to do format write correctly?
**URL:** https://discourse.julialang.org/t/how-to-do-format-write-correctly/66648
**Category:** General Usage
**Created:** [August 19, 2021, 1:30am UTC](https://discourse.julialang.org/t/how-to-do-format-write-correctly/66648 "2021-08-19T01:30:38Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@CRquantum](https://discourse.julialang.org/u/CRquantum)
#### Post date: [August 19, 2021, 1:30am UTC](https://discourse.julialang.org/t/how-to-do-format-write-correctly/66648/1 "2021-08-19T01:30:38Z")
I am sorry another stupid question, I read the IO part of the Julia documents [I/O and Network · The Julia Language](https://docs.julialang.org/en/v1/base/io-network/#Base.write), but I am still too stupid to do the following simply thing.
For example, the short illustration code below is what I wrote,
```
LL = [-1129.252,-648.5315,-553.8973,-461.6156,-356.7228,-265.5437,-170.7289,-86.96198,-40.47620,-23.48844,-20.80410]
io = open("myfile.txt", "w")
for i in 1:length(LL)
write(io, "$(i) $(LL[i]) \n")
end
close(io)
```
The output is like,
```
1 -1129.252
2 -648.5315
3 -553.8973
4 -461.6156
5 -356.7228
6 -265.5437
7 -170.7289
8 -86.96198
9 -40.4762
10 -23.48844
11 -20.8041
```
You see the line 9 and 10, the values are not very well aligned.
In Fortran, i can do format write things like,
```
do iter = 1,10
write(11,'(i10,1x,g15.7)') iter, Loglike(iter)
enddo
```
the format (i10,1x,g15.7) can make the values well aligned,
```
0 -1129.252
1 -648.5315
2 -553.8973
3 -461.6156
4 -356.7228
5 -265.5437
6 -170.7289
7 -86.96198
8 -40.47620
9 -23.48844
10 -20.80410
```
I know in Julia it can use the same printf grammar like C. However, I tried some printf grammar in the write, but it does not work.
Does anyone knows how to achieve similar effects as the Fortran results?
Thank you very much in advance!
---
### Author:  [@dlakelan](https://discourse.julialang.org/u/dlakelan)
#### Post date: [August 19, 2021, 1:35am UTC](https://discourse.julialang.org/t/how-to-do-format-write-correctly/66648/2 "2021-08-19T01:35:08Z")
[https://docs.julialang.org/en/v1/stdlib/Printf/](https://docs.julialang.org/en/v1/stdlib/Printf/)
Is what you’re looking for I think
---
### Author:  [@CRquantum](https://discourse.julialang.org/u/CRquantum)
#### Post date: [August 19, 2021, 1:51am UTC](https://discourse.julialang.org/t/how-to-do-format-write-correctly/66648/3 "2021-08-19T01:51:53Z")
> [https://docs.julialang.org/en/v1/stdlib/Printf/](https://docs.julialang.org/en/v1/stdlib/Printf/)
>
> Is what you’re looking for I think
Things like
@printf(io, “%10d %0.f \n”, i, LL[i])
did the trick.
Thanks. Sorry I did not notice that printf can serve as write.