An alternate method to open the word count dialog is to click on the status bar at the bottom of the word window

An alternate method to open the word count dialog is to right click the blue portion on the status bar at the bottom of the word window.  The status Bar will roll down showing different functions including WORD COUNT. Click WORD COUNT and it will show up on the bottom left with the count of words you have written.

which functions return a valid value without any arguments?

(-blank- and -blank- return a valid value without any arguments.)

1st -blank-

today

sqrt

count

2nd -blank-

round

now

sqrt