Convertir una string a valores ASCII hexadecimales

Dada una string como entrada, escriba un programa para convertir los caracteres de la string dada en el equivalente hexadecimal de los valores ASCII. 
Ejemplos: 

Input : Geek
Output : 4765656b 

Input :  IronMan part 3
Output : 49726f6e4d616e20706172742033

ASCII significa Código Estándar Estadounidense para el Intercambio de Información. ASCII es un estándar que asigna letras, números y otros caracteres dentro de las 256 ranuras disponibles en el código de 8 bits. Por ejemplo, el carácter «h» minúscula (Char) tiene un valor decimal de 104, que es «01101000» en binario y «68» en hexadecimal. TABLA ASCII
El sistema de numeración “Hexadecimal” o simplemente “Hex” utiliza el sistema de Base de 16. El número hexadecimal usa 16 símbolos {0, 1, 2, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F} para representar todos los números. Aquí, (A, B, C, D, E, F) representa (10, 11, 12, 13, 14, 15).
 

// C++ program to convert
// ASCII string to Hexadecimal
// format string
// Function to convert
// decimal to hexadecimal
 
#include <iostream>
 
using namespace std;
 
// function to convert decimal to hexadecimal
string decToHexa(int n)
{
    // char array to store hexadecimal number
    char hexaDeciNum[100];
 
    // counter for hexadecimal number array
    int i = 0;
    while (n != 0) {
        // temporary variable to store remainder
        int temp = 0;
 
        // storing remainder in temp variable.
        temp = n % 16;
 
        // check if temp < 10
        if (temp < 10) {
            hexaDeciNum[i] = temp + 48;
            i++;
        }
        else {
            hexaDeciNum[i] = temp + 55;
            i++;
        }
 
        n = n / 16;
    }
 
    string ans = "";
 
    // printing hexadecimal number array in reverse order
    for (int j = i - 1; j >= 0; j--)
        ans += hexaDeciNum[j];
 
    return ans;
}
// Function to convert ASCII to HEX
string ASCIItoHEX(string ascii)
{
    // Initialize final String
    string hex = "";
 
    // Make a loop to iterate through
    // every character of ascii string
    for (int i = 0; i < ascii.length(); i++) {
        // Take a char from
        // position i of string
        char ch = ascii[i];
 
        // Cast char to integer and
        // find its ascii value
        int tmp = (int)ch;
 
        // Change this ascii value
        // integer to hexadecimal value
        string part = decToHexa(tmp);
 
        // Add this hexadecimal value
        // to final string.
        hex += part;
    }
 
    // Return the final
    // string hex
    return hex;
}
int main()
{
 
    // Driver code
    // Print the Hex String
    cout << (ASCIItoHEX("Geek"));
}
 
// this code is contributed by phasing17

// Java program to convert ASCII
// string to Hexadecimal format string
import java.util.Scanner;
 
class ASCIItoHEX {
 
    // function to convert ASCII to HEX
    public static String ASCIItoHEX(String ascii)
    {
       
        // Initialize final String
        String hex = "";
 
        // Make a loop to iterate through
        // every character of ascii string
        for (int i = 0; i < ascii.length(); i++) {
 
            // take a char from
            // position i of string
            char ch = ascii.charAt(i);
 
            // cast char to integer and
            // find its ascii value
            int in = (int)ch;
 
            // change this ascii value
            // integer to hexadecimal value
            String part = Integer.toHexString(in);
 
            // add this hexadecimal value
            // to final string.
            hex += part;
        }
       
        // return the final string hex
        return hex;
    }
 
    // Driver Function
    public static void main(String arg[])
    {
        // print the Hex String
        System.out.println(ASCIItoHEX("Geek"));
    }
}

# Python3 program to convert ASCII
# string to Hexadecimal format string
 
# function to convert ASCII to HEX
def ASCIItoHEX(ascii):
 
    # Initialize final String
    hexa = ""
 
    # Make a loop to iterate through
    # every character of ascii string
    for i in range(len(ascii)):
 
        # take a char from
        # position i of string
        ch = ascii[i]
 
        # cast char to integer and
        # find its ascii value
        in1 = ord(ch)
   
        # change this ascii value
        # integer to hexadecimal value
        part = hex(in1).lstrip("0x").rstrip("L")
 
        # add this hexadecimal value
        # to final string.
        hexa += part
 
    # return the final string hex
    return hexa
   
# Driver Function
if __name__ == '__main__':
 
    # print the Hex String
    print(ASCIItoHEX("Geek"))
 
# This code is contributed by pratham76

// C# program to convert
// ASCII string to Hexadecimal
// format string
using System;
class GFG{
     
// Function to convert
// decimal to hexadecimal
static string decToHexa(int n)
{   
  // char array to store
  // hexadecimal number
  char []hexaDeciNum =
         new char[100];
 
  // counter for hexadecimal
  // number array
  int i = 0;
   
  while(n != 0)
  {   
    // temporary variable
    // to store remainder
    int temp  = 0;
 
    // Storing remainder
    // in temp variable.
    temp = n % 16;
 
    // Check if temp < 10
    if(temp < 10)
    {
      hexaDeciNum[i] =
          (char)(temp + 48);
      i++;
    }
    else
    {
      hexaDeciNum[i] =
          (char)(temp + 87);
      i++;
    }
 
    n = n / 16;
  }
 
  string ans = "";
 
  // Printing hexadecimal number
  // array in reverse order
  for(int j = i - 1;
          j >= 0; j--)
  {
    ans += hexaDeciNum[j];
  }
 
  return ans;
}  
 
// Function to convert ASCII to HEX
public static string ASCIItoHEX(string ascii)
{
  // Initialize final String
  string hex = "";
 
  // Make a loop to iterate through
  // every character of ascii string
  for (int i = 0;
           i < ascii.Length; i++)
  {
    // Take a char from
    // position i of string
    char ch = ascii[i];
 
    // Cast char to integer and
    // find its ascii value
    int tmp = (int)ch;
 
    // Change this ascii value
    // integer to hexadecimal value
    string part = decToHexa(tmp);
 
    // Add this hexadecimal value
    // to final string.
    hex += part;
  }
   
  // Return the final
  // string hex
  return hex;
}
  
// Driver code
public static void Main(string []arg)
{
  // Print the Hex String
  Console.Write(ASCIItoHEX("Geek"));
}
}
 
// This code is contributed by rutvik_56

<script>
      // JavaScript program to convert
      // ASCII string to Hexadecimal
      // format string
      // Function to convert
      // decimal to hexadecimal
      function decToHexa(n) {
        // char array to store
        // hexadecimal number
        var hexaDeciNum = new Array(100).fill(0);
 
        // counter for hexadecimal
        // number array
        var i = 0;
 
        while (n !== 0) {
          // temporary variable
          // to store remainder
          var temp = 0;
 
          // Storing remainder
          // in temp variable.
          temp = n % 16;
 
          // Check if temp < 10
          if (temp < 10) {
            hexaDeciNum[i] = String.fromCharCode(temp + 48);
            i++;
          } else {
            hexaDeciNum[i] = String.fromCharCode(temp + 87);
            i++;
          }
 
          n = parseInt(n / 16);
        }
 
        var ans = "";
 
        // Printing hexadecimal number
        // array in reverse order
        for (var j = i - 1; j >= 0; j--) {
          ans += hexaDeciNum[j];
        }
 
        return ans;
      }
 
      // Function to convert ASCII to HEX
      function ASCIItoHEX(ascii) {
        // Initialize final String
        var hex = "";
 
        // Make a loop to iterate through
        // every character of ascii string
        for (var i = 0; i < ascii.length; i++) {
          // Take a char from
          // position i of string
          var ch = ascii[i];
 
          // Cast char to integer and
          // find its ascii value
          var tmp = ch.charCodeAt(0);
 
          // Change this ascii value
          // integer to hexadecimal value
          var part = decToHexa(tmp);
 
          // Add this hexadecimal value
          // to final string.
          hex += part;
        }
 
        // Return the final
        // string hex
        return hex;
      }
 
      // Driver code
      // Print the Hex String
      document.write(ASCIItoHEX("Geek"));
    </script>