Can u plz explain how's the output '-128' A challenge Q&A of sololearn quiz

Question

The question posted was as follows
byte by=1;
while(by>0)
b++;
System.out.print(by);
The right output given was '-128'
Can u plz explain the logic behind it.

Answer 1

Every number type has a limit to what it can hold.
A byte can hold the numbers from -128 to 127.
So if you add 1, after a while the byte 'overflows'.
Then it starts over from the bottom end and now is < 0.

Answer 2

HonFu thanks bro Had similar thoughts but wanna verified.

Answer 3

Dint get u?

Answer 4

while(by>0) {
++by;
printf("%d", by);
}
Like this, you can examine what happens.

Answer 5

A good way to verify that sort of thing (also to debug short codes):
Rewrite the code, but output the values!
That way you can exactly follow what happens step by step.

Answer 6

HonFu u were too in pythonist grp right?