Write a function that returns a decimal number from a binary string. The functio

Question

Write a function that returns a decimal number from a binary string. The function header is as follows int bin2 Dec (const strings binarystring) For example, binarystring 10001 is 17 (1 x 2^4 0 x 2^3 0 x 2^2 0 x 2 + 1 x 2^0 = 17) So, bin2 Dec ("10001") returns 17. Write a function that parses a decimal number into a binary number as a string. The function header is as follows: string dec2Bin (int value) For example, dec2Bin (17) returns string "10001" Write a test program that prompts the user to enter a binary or decimal number and display its equivalent value in decimal or binary.

Explanation / Answer

BinaryConversion.java

package binary;

/**
*
* @author Naresh Kumar
*
*/
public class BinaryConversion {

   /**
   * This method is responsible to convert binary to decimal value
   * @param binaryNumber
   * @return
   */
   public static int bin2Dec(String binaryNumber) {
       int decimalValue= 0;
       int power = 0;
       int binaryValue = Integer.parseInt(binaryNumber);
       while (true) {
           if (binaryValue == 0) {
               break;
           } else {
               int tmp = binaryValue % 10;
               decimalValue += tmp * Math.pow(2, power);
               binaryValue = binaryValue / 10;
               power++;
           }
       }
       return decimalValue;
   }
  
   /**
   * This method is responsible to convert decimal to binary value
   * @param binaryNumber
   * @return
   */
   public static String dec2Bin(int binaryNumber) {
       return Integer.toBinaryString(binaryNumber);
   }

}

Test.java

package binary;

import java.util.Scanner;
/**
*
* @author Naresh Kumar
*
*/
public class Test {
  

   public static void main(String[] args) {
       Scanner scan = new Scanner(System.in);
       System.out.println("Enter decimal value :");
       String input = scan.nextLine();
       System.out.println(BinaryConversion.bin2Dec(input));
       System.out.println("Enter binary value :");
       int binaryInput = scan.nextInt();
       System.out.println(BinaryConversion.dec2Bin(binaryInput));
       scan.close();
   }

}

Output

Enter decimal value :
10001
17
Enter binary value :
17
10001

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