Write a program that checks the initial value in memory location x4000 to see if it is a valid ASCII code and if it is a valid ASCII code, print the character. If the value in x4000 is not a valid ASCII code, the problem prints nothing.

Please anwser the following question regarding ios app development.

python

I am having an issue with this program, I keep getting the number 15 everytime I type in a code. There is also the instructions for the module itself. //PSEUDOCODE    //Write a program that prompts the user for a binary number    //(from 3 to 8 bits) as a String and converts it to base-10 decimal value    //There are several ways to do this in Java but your program must use a for loop and first principles to perform the conversion    //Print the base-10 number when the loop ends    public static void main(String args[]) {        long sum = 0;                System.out.println("Enter a binary number: ");        Scanner scan = new Scanner(System.in);        String s = scan.next();                long result = 0;        for (int i = 0; i < s.length(); i++) {            result = (long) (result + (s.charAt(1) - '0') * Math.pow(2, s.length()- i - 1));        scan.close();        }        System.out.println(result);            }}