rot13.cpp

// Demonstrate the common "ROT13" version of the Caesar cipher.
 
#include <iostream>
#include <z/all.hpp>
 
int main(int argc, char **argv) {
    zstring from = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
    zstring to = "nopqrstuvwxyzabcdefghijklmNOPQRSTUVWXYZABCDEFGHIJKLM";
    for (int i = 1; i < argc; ++i) {
        // The easiest way is to use a set of characters to perform the cipher.
        (zstring(argv[i]) + " ").cipher(from, to).write(std::cout);
 
        // Alternatively, you can pass a function in to perform the cipher.
        // This is almost always faster than mapping with the `to`/`from` strings.
        /*
        (zstring(argv[i]) + " ").cipher([](auto chr) {
            if (z::core::isLowerAlpha(chr)) {
                return ((chr - 'a') + 13) % 26 + 'a';
            } else if (z::core::isUpperAlpha(chr)) {
                return ((chr - 'A') + 13) % 26 + 'A';
            }
 
            return chr;
        }).write(std::cout);
        */
    }
    zstring().writeln(std::cout);
}