/* An example of using the xOr bitwise operator to manipulate characters within a string. [ Usage Example (Code Playground) ] Enter a key string Enter a sample string Hit Submit button [ NOTE ] You can enter multiple sample strings, each separated by new line . Every sample will be processed by the same key given as the first input. Each non printable characters in the processed samples will be substituted with a dot '.' to avoid misunderstanding of the character assumed as blank. © 2018 SoloLearn Community */ #include #include /* Function makeKey Description: A helper function that calculates a key one can use to pass into xOrString function. Parameters: string : input string Return value: unsigned int, calculated key */ unsigned int makeKey(std::string sKey) { unsigned int rv {0}; for(char ch : sKey) rv ^= (unsigned int) ch; return rv; } /* Function xOrString Description: A function that performs xOr bitwise operator on each characters in string and return the modified string. Parameters: string : input string unsigned int : Value used for operation Return value: string, modified string. */ std::string xOrString(std::string s, unsigned int key) { for(char& ch : s) ch ^= key; return s; } // Main procedure int main() { const std::string sample_separator(35, '-'); const char npc {'.'}; std::string x, sKey, s; unsigned key; std::cout << "Enter the key string, a new line (Enter) followed by multiple sample string(s) each separated by new line."; std::cin >> sKey; if(sKey.empty()) { std::cout << "\n\n** No key string was given!\n** Using default 'SoloLearn'"; sKey = "SoloLearn"; } key = makeKey(sKey); std::cout << "\n\n** Key: '" << sKey << "' (" << key << ")"; std::cout << "\n\nNOTE: Processed samples output uses a dot '.' to substitute the non printable characters."; while(true) { // Get input string std::getline(std::cin, s); if(!std::cin.good()) break; if(s.empty()) continue; std::cout << "\n\nSample string:\n" << s; // Perform XOR operation on each char // in and display the result. // NOTE: // A dot is used in place of some non // printable characters to not to // mistake the blanks in output. // [ Suggested by Gordie ] x = xOrString(s, key); std::cout << "\n\nxOr'ed string:\n"; for(char letter : x) { if(std::isgraph(letter)) std::cout << letter; else std::cout << npc; } // Display reversed version of the // XOR'ed string back. This normally // mean the original input string. std::cout << "\n\nReverse xOr'ed string:\n" << xOrString(x, key) << "\n\n" << sample_separator; } }

Bitwise XOR on characters