safe variant:
Code
bool lFirstTick=false;
int nOldBar=-1;
function tick(){
    if (lFirstTick)
        printf("\nBar %i of %i last is %i",Bar,NumBars,EndBar);
    lFirstTick=false;
}

function run()
{
    BarPeriod = 1;
    LookBack = 1;
    if (is(INITRUN))
    {
        set(TICKS);
        lFirstTick=false;
        nOldBar=Bar;
    }

    if (Bar > nOldBar){
        nOldBar=Bar;
        lFirstTick=true;
    }
}