Have the function CaesarCipher(str,num) take the str parameter and perform a Caesar Cipher shift on it using the num parameter as the shifting number. A Caesar Cipher works by shifting each letter in the string N places down in the alphabet (in this case N will be num). Punctuation, spaces, and capitalization should remain intact.
For example : if the string is "Caesar Cipher" and num is 2 the output should be "Ecguct Ekrjgt".
Caesar Cipher Solution In java
import java.util.Scanner;
public class CaesarCipher {
final String ALPHABET =
"abcdefghijklmnopqrstuvwxyz";
final String UPPER_ALPHABET = ALPHABET
.toUpperCase();
String CaesarCipher(String str, int num) {
StringBuilder result = new StringBuilder("");
for (char c : str.toCharArray()) {
int index = ALPHABET.indexOf(c);
if (index != -1) {
index += num;
if (index > ALPHABET.length() - 1) {
index -= ALPHABET.length();
}
result.append(ALPHABET.charAt(index));
} else {
index = UPPER_ALPHABET.indexOf(c);
if (index != -1) {
index += num;
if (index > UPPER_ALPHABET.length() - 1)
{
index -= UPPER_ALPHABET.length() - 1;
}
result.append(UPPER_ALPHABET
.charAt(index));
} else {
result.append(c);
}
}
}
return result.toString();
}
public static void main (String[] args) {
// keep this function call here
Scanner s = new Scanner(System.in);
CaesarCipher c = new CaesarCipher();
System.out.print(c.CaesarCipher(s
.nextLine(), 4));
}
}
