Convert a string to hexadecimal ASCII values

26 May, 2022
Given a string as input, write a program to convert the characters of the given string into the hexadecimal equivalent of ASCII values. Examples : 
Input : Geek
Output : 4765656b 

Input :  IronMan part 3
Output : 49726f6e4d616e20706172742033
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.ASCII TABLEThe “Hexadecimal” or simply “Hex” numbering system uses the Base of 16 system. 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). 
Algorithm : 
Initialize final Hex string as empty.Consider every character from input, cast it into integer. This integer value is ascii value of that character.Change this integer value into hexadecimal value and add this hexadecimal value to final Hex string.
Initialize final Hex string as empty.
Consider every character from input, cast it into integer. This integer value is ascii value of that character.
Change this integer value into hexadecimal value and add this hexadecimal value to final Hex string.
Basic implementation of the above idea:  
C++
Java
Python3
C#
Javascript
// 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 hexadecimalstring 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 HEXstring 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 stringimport 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 HEXdef 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 Functionif __name__ == '__main__':     # print the Hex String    print(ASCIItoHEX("Geek")) # This code is contributed by pratham76
// C# program to convert// ASCII string to Hexadecimal// format stringusing System;class GFG{     // Function to convert// decimal to hexadecimalstatic 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 HEXpublic 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 codepublic 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>
Output:  
4765656b
rutvik_56
pratham76
rdtank
phasing17
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