CareerCup

1- Convert the text to Upper case
2- 'A' Char value in ASCII is 65, subtract 64 and you get your 1 ('B' = 66 , 66 - 2 = 64)

Here is the code

public static void encryption(string text, int n)
        {
            text = text.ToUpper();
            int temp;
            foreach (char x in text)
            {
                temp = (((int)x - 64) * n) % 26;
                Console.WriteLine(temp);
            }
        }

public static String encryption(String s, int n){
s=s.toUpperCase();
String result="";
for(int i=0;i<s.length();i++){
result+=(s.charAt(i)-'A'+1)*n%26;
}
return result;
}

String getEncryptedString(String s, int n) {
        StringBuilder result = new StringBuilder();
        for (int i = 0; i < s.length(); i++) {
            result.append((char) (((s.charAt(i) - 'a' + 1) * n - 1) % 26 + 'a'));
        }
        return result.toString();
    }

Python version

def encrypt(aString):
	string = aString.lower()
	dict = {'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5, 'f': 6, 'g': 7, 'h': 8, 'i': 9, 'j': 10, 'k': 11, 'l': 12, 'm': 13, 'n': 14, 'o': 15, 'p': 16,
	'q': 17, 'r': 18, 's': 19, 't': 20, 'u': 21, 'v': 22, 'w': 23, 'x': 24, 'y': 25, 'z': 26}
	alphabet = ('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')
	result = ''
	for i in range(len(string)):
		temp = dict[string[i]] * 4 			
		result += alphabet[(temp % 26) - 1]
	return result

public static String multiplicative(String message, int number) {

		String encrypted = "";
		int letterValue;
		for (int i = 0; i < message.length(); i++) {
			// ascii 'a' starts at decimal value 97, b = 98, c = 99, etc
			letterValue = (message.charAt(i) - 96) * number;
			while (letterValue > 25) {
				letterValue = letterValue % 26;
			}
			encrypted += (char) (letterValue + 96);
		}
		System.out.println(encrypted);
		return encrypted;
	}

}

public static String encryption(String s, int n){
s=s.toUpperCase();
String result="";
for(int i=0;i<s.length();i++){
result+=(s.charAt(i)-'A'+1)*n%26;
}
return result;
}

c++ sol

#include <iostream>
#include <string>
#include <algorithm>
#include <iterator>

using namespace std;

string encryp(const string &s, int n){
	string result{};
	transform(s.cbegin(),s.cend(),back_inserter(result),[&](char c){
		return char((((c-'A'+1)*n%26)+'A'-1));
		});
	return result;
}

int main(){
	string s("BOYU");
	cout<<encryp(s,6)<<endl;
}

Can anybody explain the meaning of the question? I'm kind of confused.

Can anybody explain the meaning of the question? I'm kind of confused.

public class encript {
	
	
	public static void main(String[] arg){
	String str = "aTce";
	
	str = str.toUpperCase();
	int n = 4;
	
	
	for(int i=0; i<str.length(); i++)
	{
		int val = str.charAt(i) - 64;
		val = val*n - 1;
		if(val>26)
		{
			val = val%26;
		}
		char c = (char)(val+'a');
		System.out.print(c);
	}
	}

}

import java.util.*;
public class Encryption {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		HashMap mp=new HashMap();
		mp.put('a', 1); mp.put('b', 2); mp.put('c', 3); mp.put('d', 4); mp.put('e', 5); mp.put('f', 6); mp.put('g', 7);
		mp.put('h', 8); mp.put('i', 9); mp.put('j', 10); mp.put('k', 11);  mp.put('l', 12); mp.put('m', 13); mp.put('n', 14);
		mp.put('o', 15); mp.put('p', 16); mp.put('q', 17); mp.put('r', 18); mp.put('s', 19); mp.put('t', 20);
		mp.put('u', 21); mp.put('v', 22); mp.put('w', 23);mp.put('x', 24); mp.put('y', 25);mp.put('z', 26);
		
		char[] alphabets={'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'};
		String str="SANTHOSH";
		str=str.toLowerCase();
		String output=null;
		int temp;
		for(int i=0;i<str.length();i++){
			temp=(Integer) mp.get(str.charAt(i)) * 4;
			if(temp>26){
				temp=temp%26;
			}
			if(output==null){
				output=Character.toString(alphabets[temp-1]);				
			}
			else
			{
				output+=Character.toString(alphabets[temp-1]);	
			}
			
		}
		System.out.println("\n"+output);

	}

}