#define Creator "尺ㄖ卄丨ㄒ" #include #include #include #include using namespace std; //Caesar Cipher challenge bool isDigitPresent(const string& s) { return any_of(s.begin(), s.end(), ::isdigit); } string encrypt(string s) { string ans; for (int i = 0; i < s.length(); i++) if ((s[i] >= 'A' && s[i] <= 'Z') || (s[i] >= 'a' && s[i] <= 'z') || s[i] == ' ') { //if (s[i] >= 'z') s[i] = 'a' - 1;// //if (s[i] == 'Z') s[i] = 'A' - 1;// /*(OR)*/ if (s[i] == 'z' || s[i] == 'Z') // if 'z' OR 'Z' make it 'a' OR 'A' s[i] = (int)s[i] - 26; if (s[i] == ' ') // if 'space' make it added to ans s[i] = ' ' - 1; int t = (int)s[i]; // if 'a' make it 'b' and vice versa ans += (t + 1); } return ans; } string decrypt(string s) { string ans; for (int i = 0; i < s.length(); i++) if ((s[i] >= 'A' && s[i] <= 'Z') || (s[i] >= 'a' && s[i] <= 'z') || s[i] == ' ') { //if (s[i] == 'a') s[i] = 'z' + 1;// //if (s[i] == 'A') s[i] = 'Z' + 1;// /*(OR)*/ if (s[i] == 'a' || s[i] == 'A') // if 'a' OR 'A' make it 'z' OR 'Z' s[i] = (int)s[i] + 26; if (s[i] == ' ') s[i] = ' ' + 1; int t = (int)s[i]; ans += (t - 1); } return ans; } int main(void) { string str; getline(cin, str); // check if input is blank or digit enter set str to default string if (str == "" || isDigitPresent(str) == true || str == " ") { str = "defend the east wall of the castle"; cout << "Default string: \"" << str << "\"\n"; }else cout << "Your string: \"" << str << "\"\n"; cout << "After encrypting: " << encrypt(str) << endl; cout << "Again, decrypting: " << decrypt(encrypt(str)) << endl; }

Caesar Cipher CHLG