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My professor wants me to: 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. With a for loop which I have in the program, I need help prompting the user to only use 3 to 8 bits. public static void main(String args[]) {                  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(i) - '0') * Math.pow(2, s.length()- i - 1));         scan.close();         }         System.out.println(result);             }

My professor wants me to: 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. With a for loop which I have in the program, I need help prompting the user to only use 3 to 8 bits. public static void main(String args[]) {                  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(i) - '0') * Math.pow(2, s.length()- i - 1));         scan.close();         }         System.out.println(result);             }

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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My professor wants me to: 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. With a for loop which I have in the program, I need help prompting the user to only use 3 to 8 bits.

public static void main(String args[]) {
        
        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(i) - '0') * Math.pow(2, s.length()- i - 1));
        scan.close();
        }
        System.out.println(result);        
    }

}

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