Monoalphabetic Cipher Multiple Choice Questions and Answers (MCQs)

#include<bits/stdc++.h> 
using namespace std; 
string encrypter(string keyword) 
{ 
	string encoded = ""; 	
	bool arr[26] = {0}; 
	for (int i=0; i<keyword.size(); i++) 
	{ 
		if(keyword[i] >= 'A' && keyword[i] <= 'Z') 
		{ 		
			if (arr[keyword[i]-65] == 0) 
			{ 
				encoded += keyword[i]; 
				arr[keyword[i]-65] = 1; 
			} 
		} 
		else if (keyword[i] >= 'a' && keyword[i] <= 'z') 
		{ 
			if (arr[keyword[i]-97] == 0) 
			{ 
				encoded += keyword[i] - 32; 
				alpha[keyword[i]-97] = 1; 
			} 
		} 
	} 
	for (int i=0; i<26; i++) 
	{ 
		if(arr[i] == 0) 
		{ 
			arr[i]=1; 
			encoded += char(i + 65); 
		} 
	} 
	return encoded; 
} 
string ciphertxt(string msg, string encoded) 
{ 
	string cipher=""; 
	for (int i=0; i<msg.size(); i++) 
	{ 
		if (msg[i] >='a' && msg[i] <='z') 
		{ 
			int pos = msg[i] - 97; 
			cipher += encoded[pos]; 
		} 
		else if (msg[i] >='A' && msg[i] <='Z') 
		{ 
			int pos = msg[i] - 65; 
			cipher += encoded[pos]; 
		} 
		else
		{ 
			cipher += msg[i]; 
		} 
	} 
	return cipher; 
} 
int main() 
{ 
	string keyword; 
	keyword = "cipher"; 	
	string encoded = encrypter(keyword); 
	string message = "hello"; 
	cout  << ciphertxt(message,encoded) << endl; 
	return 0; 
}

package com.sanfoundry.setandstring;
import java.util.Scanner;
public class MonoalphabeticCipher
{
      public static char p[]  = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
                                  'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
                                  'u', 'v', 'w', 'x', 'y', 'z' };
      public static char ch[] = { 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P',
                                  'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', 'Z',
                                  'X', 'C', 'V', 'B', 'N', 'M' };
      public static String doEncryption(String s)
      { 
           char c[] = new char[(s.length())];
           for (int i = 0; i < s.length(); i++)
           {
                for (int j = 0; j < 26; j++)
                { 
                     if (p[j] == s.charAt(i))
                     {
                         c[i] = ch[j];
                          break;
                     }
                }
            }  return (new String(c));
        }   
        public static void main(String args[])
        {
             Scanner sc = new Scanner(System.in);
             System.out.println("Enter the message: ");
             String en = doEncryption(sc.next().toLowerCase());
             System.out.println("Encrypted message: " + en);
             sc.close();
         }
}