How can I use input.close()?

Hello,

I have programmed a calculator in Java that is reusable (five times) without restarting the code. After these five calculations, I want another program to be executed, but this is only possible after I

 input.close()

But no matter where I

 input.close()

place, there is an error.

Now my question: Where do I have to

 input.close()

write down so that the code works?

Thank you in advance.

 import java.util.Scanner; class Main { public static void main(String[] args) { int z = 0; while (z < 5) { z = z + 1; Scanner input = new Scanner(System.in); System.out.println("1. Zahl: "); double Zahl1 = input.nextDouble(); System.out.println("Operator: "); char Operator = input.next().charAt(0); System.out.println("2. Zahl: "); double Zahl2 = input.nextDouble(); switch (Operator) { case '+': double A1 = Zahl1 + Zahl2; System.out.println("=" + A1); break; case '-': double A2 = Zahl1 - Zahl2; System.out.println("=" + A2); break; case '*': double A3 = Zahl1 * Zahl2; System.out.println("=" + A3); break; case '/': double A4 = Zahl1 / Zahl2; System.out.println("=" + A4); break; default: System.out.println("Fehler"); } } } }