How to put an alphabetic percent sign (%) inside F # printf format strings?

Question

I want to print the% sign using the F # printfn function. After stroking the format syntax , this should do the trick: printfn "%%" . Apparently not ...

Interactive F # output:

 > printfn "%%";; %% val it : unit = () 

Weird ...

I use F # 3.1 and .NET 4.5, the F # interactive session uses .NET 4.0. Same.

For reference: printfn "%" does not compile (missing format specifier) ​​and printfn "%s" "%" is my current workaround ...

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Update:

When I change the target runtime of F # from 3.1 to 3.0, it works. Is this a bug in version 3.1?

Answer 1

If printfn "%%" prints two percent signs ( %% ) instead of one percent sign ( % ), then you should update F # 3.1 at least to version 3.1.1.

If you are using Visual Studio 2013, you can do this using tools → Extensions and Updates → Updates → Visual Studio Gallery → Visual FSharp Tools.