I have the following error:
Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Scanner.java:864)
at java.util.Scanner.next(Scanner.java:1485)
at java.util.Scanner.nextInt(Scanner.java:2117)
at java.util.Scanner.nextInt(Scanner.java:2076)
at javaapplication2.JavaApplication2.main
The error occurs because you are trying to read an integer, e.nextInt() , and what you entered is a c character. I recommend, for you to avoid this type of errors, that you read the user's input as String and then in the validate code that really corresponds to what you expect. Example:
int num;
String entrada = w.nextLine();
if (entrada.matches("\d+")) {
// como la entrada es un número entero
num = Integer.parseInt(entrada);
} else {
// Pedirle al usuario que vuelva a entrar la información
}