Something weird

Question

https://code.sololearn.com/cJaUUFw4Y5y7/?ref=app

How does this code go into negatives??? Like what in the holy hot crispy Kentucky fried chicken frick?
Tryin to make a Fibonacci code.

https://code.sololearn.com/cJaUUFw4Y5y7/?ref=app

Answer 1

By default a java int is signed which means the last bit is used to signal if the number should be positive or negative. you end up overflowing that bit causing numbers to become negative by accident

Answer 2

No clue, you can look up the supported ranges for java data types in the documentation. long will give you a larger range but will still overflow eventually

Answer 3

yo thats kinda weird

Answer 4

do they explain that in the java course?

Answer 5

oh ok. thx man!