Question: Problem with "if" and the ";" (mapple 14)

Hello,

First of all I'm French so excuse my English.

I have some questions about Maple 14 on MacOSX,

1- I want to use the "proc()" fuction with an "if" fuction in the "proc()" but it's not workink, I tested many display with the "print" command to evaluate where is the problem and now I can say that the problem is in the "if" fuction. Here his my worksheet :

> suite := proc (n) local u, k, i; u := n; k := 0; for i from 0 to 10 do print(irem(u, 2), evalb(irem(u, 2) = 0)); if evalb(irem*(u, 2) = 0) then u := (1/2)*u; print("on divise par 2") else u := 3*u+1; print("*3+1") end if; print(u); k := k+1 end do; return k end proc;
print(`output redirected...`); # input placeholder
proc(n)  ...  end;
> suite(2);

print(`output redirected...`); # input placeholder
                            0, true
                             "*3+1"
                               7
                            1, false
                             "*3+1"
                               22
                            0, true
                             "*3+1"
                               67
                            1, false
                             "*3+1"
                              202
                            0, true
                             "*3+1"
                              607
                            1, false
                             "*3+1"
                              1822
                            0, true
                             "*3+1"
                              5467
                            1, false
                             "*3+1"
                             16402
                            0, true
                             "*3+1"
                             49207
                            1, false
                             "*3+1"
                             147622
                            0, true
                             "*3+1"
                             442867
                               11

Have you got any idea ?

2- At school I use to work on Maple 7.5 or 9.5 (I don't really remember) on Windows, but at home I work on Maple 14 on MacOSX, and I want to know what are the differents between the two versions and why the ";" is useless in Maple 14.

3- I've heard that I can use the old interface/classic worksheet but I don't know how to do.

Thanks for helping.

Have a nice day.
Ben