Stuck at “Exception in thread ”main" java.util.NoSuchElementException

Question

I wrote a program with a separate class but I keep getting the same error right after the user inputs the three sides.

The main code is:

package interac         


        

Answer 1

Scanner#nextDouble throws NoSuchElementException

if the input is exhausted

The way do avoid it, and the correct way to use scanner generally (also for iterators) is to first check if there is such an input available. Try:

if (scanner.hasNextDouble())
    scanner.nextDouble();

If the call returns false then there is simply no double to read.