When I try to run this code below and I enter any number I get this error - Exception in thread "main" java.lang.NumberFormatException: For input string: ""
How can this be resolved?
Asked
Active
Viewed 56 times
1
-
Does this answer your question? [What is a NumberFormatException and how can I fix it?](https://stackoverflow.com/questions/39849984/what-is-a-numberformatexception-and-how-can-i-fix-it) – Arnaud Claudel Mar 24 '20 at 17:18
-
you can write sum = sum + currentNumber; statement like this sum += currentNumber; just advice, not related with your question's answer – User8500049 Mar 24 '20 at 17:18
-
post your code here – Nilanka Manoj Mar 29 '20 at 15:19
2 Answers
0
Try with
int n = scanner.nextInt();
instead of
int n = Integer.parseInt(scanner.nextLine());
develo
- 66
- 2
0
@develo is partially right by suggesting the use of scanner.nextInt() though if you do that you will also need to remove the calls to Integer.parseInt (.nextInt() will return an int, so no need to parse it into an Integer)
However, the core problem with your code is the loop. You loop starts from 0 and you are looping 1 too many times like this:
for (int i = 0; i <= n; i++ ) {
Change it to either for (int i = 0; i < n; i++ ) { or for (int i = 1; i <= n; i++ ) { and it will work fine.
Is this a college or university task by any chance? :) (my son is doing a CS degree and this type of code looks familiar :) )
Also, java convention is that classnames always start with a capital letter - so your classname should be SumOfNumbers with a filename of SumOfNumbers.java
Nathan Russell
- 3,428
- 5
- 30
- 51
-
Thanks. I tried both options and still gives this error. Yes, university task :) Thank you for the correction! – Mar 24 '20 at 18:03