const string sFileName = "test2.txt";

TFileIOResult nIoResult;
TFileHandle hFileHandle;
int nFileSize = 100;
float  fParmToReadFloat = (float) 3.55;  // should only see this value if no file exists

task main()
{
   CloseAllHandles(nIoResult);                                                // make sure everything is closed
   wait1Msec(500);
   OpenRead(hFileHandle, nIoResult, sFileName , nFileSize);  // open the existing file
   ReadFloat(hFileHandle, nIoResult, fParmToReadFloat);         // read a single float value from it
   Close(hFileHandle, nIoResult);                                          // and close the file
   
   while(nNxtButtonPressed!=3)   // continue in editor until enter button is pressed
   {if (nNxtButtonPressed==1)
      {
         while(nNxtButtonPressed==1){};  // right arrow increases value
         fParmToReadFloat+=1;
      }
      if (nNxtButtonPressed==2)
      {
         while(nNxtButtonPressed==2){};  // left arrow decreases value
         fParmToReadFloat-=1;
      }
      nxtDisplayCenteredBigTextLine(6, "%3.1f", fParmToReadFloat); // update the display
   }

   Delete(sFileName, nIoResult);                     // delete pre-existing file (if any)
   nxtDisplayBigTextLine(0, "Deleted");
   wait1Msec(2000);
   nFileSize = 100;
   OpenWrite(  hFileHandle, nIoResult, sFileName, nFileSize); // create new file
   nxtDisplayBigTextLine(2, "Opened");
   wait1Msec(2000);
   WriteFloat( hFileHandle, nIoResult, fParmToReadFloat);  // write our value
   nxtDisplayBigTextLine(4, "Written");
   wait1Msec(2000);
   Close(hFileHandle, nIoResult);            // and close the file
   nxtDisplayBigTextLine(6, "Closed");
   wait1Msec(2000);
}