Question

2 Write a recursive method that parses a hex number as a string into a decimal integer. The method header is: public static int hex. 2 Dec (String hexstring) Write a pensare cam that that prompts the user to enter a hex, string & displays its decimal equivalent. Recalls Anc=1010566-110. z 490 Use the following her values to convert: BAD, BAC98, BabA73

This needs too be in java programming language

Answer 1

Recursive program is Java To convert Hex to Decimal

Code is

import java.util.*;
public class Main
{

public static int hex2Dec(String hexString) {
int decimal = 0;
// declare hex sequence in a string
String hexCode = "0123456789ABCDEF";
// convert input string to uppercase
hexString = hexString.toUpperCase();
int length = hexString.length();
if (length > 0) {
// check for first char on the input hexString
char ch = hexString.charAt(0);
int digit = hexCode.indexOf(ch);
String substring = hexString.substring(1);
// Now calculate the Decimal for that Hex Character
decimal = digit * (int) Math.pow(16, length - 1) + hex2Dec(substring);
}
return decimal;
}
public static void main (String[] args) {
Scanner scn=new Scanner(System.in);
System.out.println("Enter the Hexadecimal String ");
String str=scn.next();
// Print the result
System.out.println("The Decimal Value is "+hex2Dec(str));
}

}

Code Screen And Outputs

8 9 10 12 Main.java 1 import java.util.*; 2 public class Main 3-{ 4 5 public static int hex2Dec(string hexString) { 6 int decimal = 0; 7 // declare hex sequence in a string String hexCode = "0123456789ABCDEF"; // convert input string to uppercase hexstring hexstring.toUpperCase(); 11 int length hexstring.length(); if (length > 0) { 13 // check for first char on the input hexstring 14 char ch = hexstring.charAt(); 15 int digit = hexCode.indexOf(ch); 16 string substring = hexstring.substring(1); 17 // Now calculathe Decimal for that Hex Character 18 decimal = digit * (int) Math.pow(16, length - 1) + hex2Dec (substring); 19 20 return decimal; 21 } 22- public static void main(string[] args) { 23 Scanner scn=new Scanner(System.in); 24 System.out.println("Enter the Hexadecimal string "); 25 String str=scn.next(); 26 // Print the result 27 System.out.println("The Decimal value is " +hex2Dec(str)); 28 } 29 30 31 } } Enter the Hexadecimal String BAD The Decimal value is 2989

Enter the Hexadecimal String BabA73 The Decimal value is 12237427 ...Program finished with exit code 0 Press ENTER to exit console.

Enter the Hexadecimal String BAC98 The Decimal value is 765080 ... Program finished with exit code o Press ENTER to exit console.

This is how you can write the program for Hex2Dec using recursion in Java

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