[NSRCA-discussion] Chapter-12 computer science.

[Duane Beck]

num is incremented in the body of the loop, before cnt is incremented at 
the end of the loop (right before it checks the loop condition again). 
So, num equals 1 when cnt is incremented to 1 at the end of the loop, 
before the condition is checked a second time.  Next time through the 
loop, num is incremented to 2 before cnt increments to 2.  When cnt 
equals 256 at the loop condition check (assuming it's able to represent 
such a value), num will have already been incremented to 256 in the 
previous pass through the loop body.

In general, it's poor practice to use chars for integer math.  If you 
need a small integer, use short instead.

Martin X. Moleski, SJ wrote:
> OK, I agree that cnt is incremented to 256 if it is
> the right type to do so.
> 
> Seems to me num can only reach 255.