字符变换

#include <iostream>#include <string>using namespace std;int main(){string str;getline(cin, str);for (int i =0; i < str.size(); ++i){if (str[i] <= 'U' && str[i] >= 'A'){str[i] ='a' + str[i] - 'A' + 5;}else if (str[i] <= 'Z' && str[i] >= 'V'){str[i] ='a' + (str[i] - 'A'  -21)%26;}}cout<<str<<endl;return 0;}