GTU OOP Program - 15

15). Write the bin2Dec (string binary String) method to convert a binary string into a decimal number. Implement the bin2Dec method to throw a NumberFormatException if the string is not a binary string. 

import java.util.Scanner;

class Program_15 {

    public static int bin2Dec(String binString) throws NumberFormatException {

        int decimal = 0;
        int strLength = binString.length();
        for (int i = 0; i < strLength; i++) {
            if (binString.charAt(i) < '0' || binString.charAt(i) > '1') {
                throw new NumberFormatException("Please Enter a Binary String");
            }
            decimal += (binString.charAt(i) - '0') * Math.pow(2, strLength - i - 1);
        }
        return decimal;
    }

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.print("Enter Binary String : ");
        String str = input.nextLine();
        try {
            System.out.println("Value of binary to decimal is : " + bin2Dec(str));
        } catch (NumberFormatException e) {
            System.out.println(e);
        }
    }
}
Output
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