oh for scan, if we input 2 integers...we can do it these ways: 12 13, or 12 (new line) 13 (new line) the new line will be treated the same as space.

Scanln will read input until \n The n there is the number of variable being processed.

for this, we must input the 2 numbers separated with space, we cannot input like this: 12 (new line) 13 (new line)...it will return err: unexpected new line.