clock() function

[mickey]

hi,
I need use clock() (or similar but not QT functions!) to do this:

int done =1
while (done)  {
    clearScreen()
    if (anyPressedKey) done=0;
    float posy = clock()/20;
    mySetPos(10, posy-40); 
    print ("HELLO EVERY BODY ");
    if (posy>600) posy -= 600;
}

int done =1
while (done)  {
    clearScreen()
    if (anyPressedKey) done=0;
    float posy = clock()/20;
    mySetPos(10, posy-40); 
    print ("HELLO EVERY BODY ");
    if (posy>600) posy -= 600;
}

To copy to clipboard, switch view to plain text mode 

I need the text go down and when it reach 600 it wait a while and restart from start point...Any hints?
this code doesn't work. and float posy could reach its high bound.......
Is there a way to reset and/or stop the clock() counter????
Thanks