Scala: a way to use a function directly in println (...) using string interpolation

As of Scala 2.10+ String Interpolation can be done. So I have this question. How can you do it:

println(f"$foo(100,51)%1.0f" )

      

        
        
        
      

    

considering foo is a function like:

def foo(x1:Int , x2:Int) : Double  = { ... }

      

        
        
        
      

    

From what I understand how this is evaluated, foo is considered to have no arguments since the message I receive is:

missing arguments for method foo in object bar;
follow this method with `_' if you want to treat it as a partially applied function

      

        
        
        
      

    

I tried using parentheses, but errors still happen.