CskeCode: Lex Program that implements Caesar Cipher

/* Write a Lex program that implements the Caesar cipher: it replaces every letter

with the one three letters after in in alphabetical order, wrapping around at Z.

e.g. a is replaced by d, b by e, and so on z by c. */

[a-z] {char cipher_char = yytext[0];

cipher_char += 3;

if (cipher_char> 'z') cipher_char -= ('z'+1- 'a');

printf ("%c" ,cipher_char );

}

[A-Z] { char cipher_char = yytext[0] ;

cipher_char += 3;

if (cipher_char> 'Z') cipher_char -= ('Z'+1- 'A');

printf("%c",cipher_char);

}

/*Output of this program*/

CskeCode