Write an integer function @word_count(s)@ that returns the number of
words in string
.
We assume all characters of
are letters and spaces. Warning: do not use the
split string method.
Sample session
About statements
The official statement of a problem is always the one
in the PDF document. The HTML version of the statement
is also given to help you, but may contain some content
that is not well displayed. In case of doubt, always use the PDF.