Convert Hexadecimal value String to ASCII value String

Given Hexadecimal value string as input, the task is to convert the given hexadecimal value string into their corresponding ASCII format string.

Examples:

Input: 6765656b73
Output: geeks

Input: 6176656e67657273
Output: avengers

The “Hexadecimal” or simply “Hex” numbering system uses the Base of 16 system. Being a Base-16 system, there are 16 possible digit symbols. Hexadecimal number uses 16 symbols {0, 1, 2, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F} to represent all numbers. Here, (A, B, C, D, E, F) represents (10, 11, 12, 13, 14, 15).
ASCII stands for American Standard Code for Information Interchange. ASCII is a standard that assigns letters, numbers, and other characters within the 256 slots available in the 8-bit code. E.g the lower case “h” character (Char) has a decimal value of 104, which is “01101000” in binary and “68” in hexadecimal.
For more ASCII values, refer ASCII TABLE.

Algorithm:

  1. Initialize final ascii string as empty.
  2. Extract first two characters from the hexadecimal string taken as input.
  3. Convert it into base 16 integer.
  4. Cast this integer to character which is ASCII equivalent of 2 char hex.
  5. Add this character to final string.
  6. Extract next two characters from hexadecimal string and go to step 3.
  7. Follow these steps to extract all characters from hexadecimal string.
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// Java program to convert hexadecimal
// string to ASCII format string
import java.util.Scanner;
  
public class HexadecimalToASCII {
  
    public static String hexToASCII(String hex)
    {
        // initialize the ASCII code string as empty.
        String ascii = "";
  
        for (int i = 0; i < hex.length(); i += 2) {
  
            // extract two characters from hex string
            String part = hex.substring(i, i + 2);
  
            // change it into base 16 and typecast as the character
            char ch = (char)Integer.parseInt(part, 16);
  
            // add this char to final ASCII string
            ascii = ascii + ch;
        }
  
        return ascii;
    }
    public static void main(String[] args)
    {
        // print the ASCII string.
        System.out.println(hexToASCII("6765656b73"));
    }
}

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Output:

geeks


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