//Challenge: Suppose encrypting message "sololearn" // First "o" and second "o" must be differently encrypted... likewise the first "l" and the second "l". // One function must perform both the encryption and decryption (I.e 1 for encryption, 2 for decryption) // My solution: Caesar's cipher with added character position // By Alper Tiryakioglu // Also: Oh yeah a new code after 5 months. //Update 1 - 20.08.2017: * Used std::getline instead of std::cin so the input can be more than one word. // * Used a more simple algorithm so that one can use every character (uppercase-lowercase letters, numbers etc.) // The first algorithm was really stupid and unnecessarily complicated. #include #include using namespace std; // Input: message string cipher(string, int, int); int main() { string msg, encoded; // Get the input cout << "Enter your message: "; //Update: It should be able to get several words at the same time now. getline(cin, msg); encoded = cipher(msg, 5, 1); cout << "Encoded message: " << encoded << endl; string decoded = cipher(encoded, 5, 2); cout << "Decoded message: " << decoded << endl; return 0; } string cipher(string msg, int offset, int mode) { string result; switch (mode) { case 1: // Encryption for(int pos = 0; pos < msg.length(); pos++) { result.push_back(msg[pos] + offset + pos); } break; case 2: // Decryption for(int pos = 0; pos < msg.length(); pos++) { result.push_back(msg[pos] - offset - pos); } break; default: cout << "Unrecognized mode " << mode << endl; result = ""; break; } return result; }

Challenge: Encrypt a message