Trunc(number) is simply the integer function. It hands you back
the number with any decimal portions thrown away (no rounding).
10.1 becomes 10 and 10.99999 becomes 10.
Mod is the remainder function from a division. It performs a
division and throws away the answer but hands you back the
remainder. 10.99999 mod 10 is 0.99999. 10.99999/10 the answer is
1 with a remainder of 0.99999.
It is handy in loops if you want to see if a counter is at every
Nth count --like every 11th time through the loop you want to do
something different. You could say if loopCounter mod 11=0 then
doSomething. The remainder will only be 0 if the loopCounter is an
even multiple of 11. I use it in this way to update a field or
check for user aborts inputs in a long loop where I don't want to
waste time doing the UI stuff every time through the loop.
It is also handy to do the opposite of the Trunc function --where
you want to throw away the whole number and keep the decimal
portion. In this case anyNumber mod 1 will do the trick. 10.99999
mod 1 gives you 0.99999.
One more useful trick:
div gives you the integer result of a division.
e.g.
104 / 10 = 10.4
104 div 10 = 10
For rounding:
104 div 10 * 10 = 100
This can be used in conjunction with mod to break a number up into
it's parts:
104 mod 10 = 4
Cheers,
Sarah
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