program demo2
c This program will not compile because, as with most Fortran
c functions, sqrt cannot be applied to integers. To compile
c the program, comment out the first print statement.
print *, "sqrt(4) = ", sqrt(4)
print *, "sqrt(4.) = ", sqrt(4.)
print *, "real(4) = ", real(4)
print *, "sqrt(real(4)) = ", sqrt(real(4))
end