FORTUPPER _ _ _ _ _ _ _ _ _ _ _ _ switch
When fortupper is on, any Fortran-style output appears in upper case. Default is off.
on fort; df(sin(7*x + y),x); ans=7.*cos(7*x+y) on fortupper; df(sin(7*x + y),x); ANS=7.*COS(7*X+Y)