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Cipher.java
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Cipher.java
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import java.util.Scanner;
public class Cipher {
char[] encoder= new char[26];
char[] decoder= new char[26];
public Cipher(int rot)
{
for (int i=0;i<26;i++)
{
encoder[i]=(char)('A'+(i+rot)%26);
decoder[i]=(char)('A'+(i-rot+26)%26);
}
}
public String encrypt(String message)
{
return transform(message,encoder);
}
public String decrypt(String secret)
{
return transform(secret,decoder);
}
public String transform(String original,char[] code)
{
char[] msg=original.toCharArray();
for (int j=0;j<msg.length;j++)
{
if( Character.isUpperCase(msg[j]));
{
int k=msg[j]-'A';
msg[j]=code[k];
}
}
return new String(msg);
}
public static void main(String[] args )
{
Scanner sc= new Scanner(System.in);
Cipher cipher= new Cipher(3);
System.out.println("encoder= "+ new String(cipher.encoder));
System.out.println("decoder= "+ new String(cipher.decoder));
String x=sc.nextLine();
int c=sc.nextInt();
String coded=cipher.encrypt(x);
System.out.println("encrypted message= "+coded);
String decoded=cipher.decrypt(coded);
System.out.println("decrypted message= "+decoded);
}
}