17- 6-25 | Fibonacci Series | While(true) is infinite loop untill we break. | InputMismatchException in scanner object | sc.next in catch block.

 //17-6-25

//Generate Fibonacci series. 0,1, 1, 2, 3, 5,8 ..... k. where k < n . n is entered by user

while(true) literally means "loop forever". The condition inside the while loop (true) is always true, so ordinarily, this loop would never terminate on its own. It's an infinite loop. we use break statement to come out of the loop.

using a try-catch block around the Scanner.nextInt() InputMismatchException means the Scanner object's nextInt() method (or nextDouble(), nextLong(), etc.) was expecting to read an integer (or a double, long, etc.), but the user typed something that couldn't be parsed as that type.

we use sc.next() in the catch block because :

clear the buffer and prevent infinite loops.

✅ What sc.next(); does:

It consumes (reads and discards) the invalid input token from the buffer, allowing the loop to prompt the user again with a clean buffer.