Write a program that user enters 4 position hexadecimal number and you output th

Question

Write a program that user enters 4 position hexadecimal number and you output the decimal value along with hexadecimal value. Thus 4A7C would output “Hexadecimal-4A70 equals decimal 19068". You can NOT use any commands to convert text to numbers. Pseudocode: input 4 digit hexadecimal number as string get each character at each position and calculate decimal number 4 A 7 C 4 16310 162 7*161 12 160 4 charAt(O) 10- charAt(1) 7 charAt(2) 12-charAt(3) HINT: Math.pow(16,indexK) is the same as 16indexk see example above. output input string as well as decimal value EXTRA CREDIT-MAKE PROGRAM READ IN HEXADECIMAL NUMBER ANY LENGTH

Explanation / Answer

HexDec.java

import java.util.Scanner;

public class HexDec {

public static void main(String[] args) {

//Creating Scanner Object for reading input string

Scanner s = new Scanner(System.in);

System.out.println("Enter the Hexadecimal number:");

//Reading String using scanner object

String hex = s.next();

//Converting String into upper case

hex = hex.toUpperCase();

//Initializing

int w=0,p=0;

char letter;

long decimal = 0L;

//Digits of a decimal value from 0 to F

String str = "0123456789ABCDEF";

//Iterate the loop from last character to 0th character

// of input String hex

for(int k=hex.length()-1;k>=0;k--){

//Get each character from input string hex

letter = hex.charAt(k);

//Find the index of character in string str

w = str.lastIndexOf(letter);

//Calculate the value for powers of 16

//in each iteration

decimal = decimal + w*(long)Math.pow(16, p);

p++;

}

//Printing the Decimal value for Given Hexadecimal

System.out.println("Hexa Decimal = "+hex+" equals decimal = "+decimal);

s.close();

}

}

Output:

Enter the Hexadecimal number:
4a7c
Hexa Decimal = 4A7C equals decimal = 19068

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