Java: Convert the number to decimal you can use Integer.parseInt with a single p

Question

Java:

Convert the number to decimal

you can use Integer.parseInt with a single parameter (that is for the default, decimal)

however you are not allowed to call the two parameter version of parseInt that allows you to use radix

for reference, converting from either a character to an int… or a String to an int

Character.getNumericValue(ch) // char to int

ch - 48 // or ch - '0', assuming your character is a digit

Integer.parseInt(s) // string to int, don't use radix for this assignment!

Example Output

Please enter a hex (0x) or binary (0b) number:

>0xFFF1

Converting from base-16 to base-10

65521

Explanation / Answer

/* package codechef; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Codechef
{
   public static void main (String[] args) throws java.lang.Exception
   {
             String digits = "0123456789ABCDEF";
            // Console console = System.console();
            // String s = console.readLine("Enter input:");
            System.out.println("Please enter a hex (0x) or binary (0b) number:");
             Scanner scan = new Scanner(System.in);
             String s = scan.next();
             s = s.toUpperCase();
             int val = 0;
             if(s.charAt(1) == 'X'){
                  System.out.println("Converting from base-16 to base-10");
                 for (int i = 2; i < s.length(); i++) {
                    char c = s.charAt(i);
                    int d = digits.indexOf(c);
                    val = 16*val + d;
                 }
                 System.out.println("values =" + val);
             }
             if(s.charAt(1) == 'B'){
                 System.out.println("Converting from base-2 to base-10");
                 for (int i = 2; i < s.length(); i++) {
                    char c = s.charAt(i);
                    int d = digits.indexOf(c);
                    val = 2*val + d;
                 }
                 System.out.println("values =" + val);
             }
   }
}

------------------------

output :

Please enter a hex (0x) or binary (0b) number: 0b1111111111110001
Converting from base-2 to base-10
values =65521

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