title: C# REPL outside Visual Studio
body: <p>F# has a REPL (read–eval–print loop) F# Interactive, <code>C:\Program Files (x86)\Microsoft F#\v4.0\Fsi.exe</code>.</p>
  
  <p>I understand C# now has its own interactive REPL, as released with <a href="http://msdn.microsoft.com/en-us/vstudio/hh543923" rel="noreferrer">Roslyn</a>. How do I open outside Visual Studio? Where is <code>csi.exe</code>?</p>