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C++ Caeser Cipher - CSC 101 - University of Southern Mississippi
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| /* | |
| * Author: Raymond Pittman | |
| * University of Southern Mississippi | |
| * | |
| * Caeser Cipher | |
| * | |
| * | |
| */ | |
| #include <algorithm> | |
| #include <cctype> | |
| #include <iostream> | |
| #include <string> | |
| std::string | |
| encrypt(std::string& s) | |
| { | |
| std::transform(s.begin(), s.end(), s.begin(), | |
| [](unsigned char c) -> unsigned char { | |
| return int(std::toupper(c)+3-65)%26+65; | |
| }); | |
| return s; | |
| } | |
| std::string | |
| decrypt(std::string& s) | |
| { | |
| std::transform(s.begin(), s.end(), s.begin(), | |
| [](unsigned char c) -> unsigned char { | |
| return int(std::toupper(c)-3-65)%26+65; | |
| }); | |
| return std::string(s); | |
| } | |
| int | |
| main() | |
| { | |
| std::string A = "ABC"; // Before | |
| std::cout << "Before -> " << A << std::endl; | |
| encrypt(A); // Encrypted | |
| std::cout << "Encrypted -> " << A << std::endl; | |
| decrypt(A); // Decrypted | |
| std::cout << "Decrypted -> " << A << std::endl; | |
| } |
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| // Go Version | |
| package main | |
| func cipher(text string, direction int) string { | |
| shift, offset := rune(3), rune(26) | |
| runes := []rune(text) | |
| for index, char := range runes { | |
| switch direction { | |
| case -1: // Encode | |
| if char >= 'a'+shift && char <= 'z' || | |
| char >= 'A'+shift && char <= 'Z' { | |
| char = char - shift | |
| } else if char >= 'a' && char < 'a'+shift || | |
| char >= 'A' && char < 'A'+shift { | |
| char = char - shift + offset | |
| } | |
| case +1: // Decode | |
| if char >= 'a' && char <= 'z'-shift || | |
| char >= 'A' && char <= 'Z'-shift { | |
| char = char + shift | |
| } else if char > 'z'-shift && char <= 'z' || | |
| char > 'Z'-shift && char <= 'Z' { | |
| char = char + shift - offset | |
| } | |
| } | |
| runes[index] = char | |
| } | |
| return string(runes) | |
| } | |
| func encrypt(text string) string { return cipher(text, -1) } | |
| func decrypt(text string) string { return cipher(text, +1) } | |
| func main() { | |
| println("Before - > ABC`") | |
| encrypted := encrypt("ABC") | |
| println("Encrypted -> " + encrypted) | |
| decrypted := decrypt(encrypted) | |
| println("Decrypted -> " + decrypted) | |
| } |
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