(C++ Builder) Get the extension of a filename

include <cassert>     //For assert

include <System.hpp> //For String


String removeExtension(const String& fileName)
{
  const int index = 0;
  const int count = fileName.Length()-4;
  return fileName.SubString(index,count);
}
void __fastcall TForm1::Button1Click(TObject *Sender)
{
  const String fileName = "autoexec.bat";
  assert( removeExtension(fileName)  == "autoexec");
}

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• #include
• assert
• const
• #include
• int
• return
• String