C-L-value-R-value
--------------------------

============  ========  ========
Expression    R-value   L-value
============  ========  ========
ch            yes       yes
&ch           yes       illegal
cp            yes       yes
&cp           yes       illegal
\*cp          yes       yes
\*c + 1       yes       illegal
\*(c + 1)     yes       yes
++cp          yes       illegal
cp++          yes       illegal
\*++cp        yes       yes
\*cp++        yes       yes
++\*cp        yes       illegal
(\*cp)++      yes       illegal
++\*++cp      yes       illegal
++\*cp++      yes       illegal
============  ========  ========