include

include

void main()

{

char str[]=”Hello World”;

char str1[11]:

char str2[11];

int i,len;

len = strlen(str);

for(i=0;i<len;i++)

{ str1[i]=str[i]&127;

printf(“%c”, str1[i]);

}

printf(“\n”);

for(i=0;i<len;i++)

{

str2[i]=str2[i]^127; printf(“%c”,str2[i]);

}

printf(“\n”);

}

OUTPUT:

cccccccc

import java.io.*;

import java.util.*:

public class SubstitutionCipher {

static Scanner sc = new Scanner(System.in);

static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

public static void main(String[] args) throws IOException {

// Alphabet for substitution

String a = “abcdefghijklmnopqrstuvwxyz”;

String b = “zyxwvutsrqponmlkjihgfedcba”;

// Input string from user

System.out.print(“Enter any string: “);

String str = br.readLine().toLowerCase(); // Convert input to lowercase for consistent

mapping

String decrypt = “”;

// Encrypt the string

for (int i = 0; i < str.length(); i++) {

char c = str.charAt(i);

if (Character.isLetter(c)) { // Check if the character is a letter

int j = a.indexOf(c);

decrypt + b.charAt(j);

} else {

decrypt += c; // Keep non-alphabet characters as is

}

System.out.println(“The encrypted data is: ” + decrypt);

output enter any string : hello
the encrypted data is : svool