I  have come up with the following expression to convert 5.1234 to 5°7'24.24" 

    toint($x) || '° ' || toint((($x) - toint ($x))*60) || '`' || substr((tostring(((($x) - toint($x))*60) - toint((($x) - toint($x))*60))*60), 1, 5) || '"'

Here’s the problem: for some  points such as 5.1234, it works. But for others, it doesn’t. I suspect the problem is the integer conversion which round up the decimal figures instead of truncating it.

Is there any other option?


  [1]: https://i.sstatic.net/60gKb.png