Write the bin2Dec(String binaryString) method to convert a binary string into a

Question

Write the bin2Dec(String binaryString) method to convert a binary string into a decimal number (your method should return an integer). Implement the bin2Dec method to throw a NumberFormatException if the string is not a binary string. Test your method in a program that prompts the user to input a binary string and uses your bin2Dec method to print out the decimal equivalent of that string. If the method throws an error, have your program catch it and print "Not a binary string, " before terminating. Enter a binary string: 1011000101 709

Explanation / Answer

NumberFormat.java

import java.util.Scanner;

public class NumberFormat{
public static void main(String[] args) {
       Scanner scan = new Scanner(System.in);
       try{
       System.out.println("Enter a binary string:");
       String s = scan.next();
       int integerValue = bin2Dec(Integer.parseInt(s));
       System.out.println("The decimal value of "+s+" is "+integerValue);
       }
       catch(NumberFormatException e){
           System.out.println(e);
       }
   }  
  
   public static int bin2Dec(int binaryNumber) throws NumberFormatException{

   int decimal = 0;
   int p = 0;
   try{
   while(true){
   if(binaryNumber == 0){
   break;
   } else {
   int temp = binaryNumber%10;
   decimal += temp*Math.pow(2, p);
   binaryNumber = binaryNumber/10;
   p++;
   }
   }
   }
   catch(NumberFormatException e){
       throw new NumberFormatException("Invalid binary number");
   }
   return decimal;
   }
}

Output:

Enter a binary string:
1011000101
The decimal value of 1011000101 is 709

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