题解 | #字符串加解密#
字符串加解密
https://www.nowcoder.com/practice/2aa32b378a024755a3f251e75cbf233a
#include <cctype> #include <iostream> #include <string> using namespace std; string jiami(string& str) { for (int i = 0; i < str.size(); i++) { if (str[i] >= 'a' && str[i] <= 'z') { if (str[i] == 'z') str[i] = 'A'; else str[i] = toupper(str[i]) + 1; } else if (str[i] >= 'A' && str[i] <= 'Z') { if (str[i] == 'Z') str[i] = 'a'; else str[i] = tolower(str[i]) + 1; } else if (isdigit(str[i])) { if (str[i] == '9') str[i] = '0'; else str[i] += 1; } } return str; } string jiemi(string& str) { for (int i = 0; i < str.size(); i++) { if (str[i] >= 'a' && str[i] <= 'z') { if (str[i] == 'a') str[i] = 'Z'; else str[i] = toupper(str[i]) - 1; } else if (str[i] >= 'A' && str[i] <= 'Z') { if (str[i] == 'A') str[i] = 'z'; else str[i] = tolower(str[i]) - 1; } else if (isdigit(str[i])) { if (str[i] == '0') str[i] = '9'; else str[i] -= 1; } } return str; } int main() { string str1;//加密数据 string str2;//解密数据 while (cin>>str1>>str2) { string ans=jiami(str1); cout << ans << endl; ans=jiemi(str2); cout << ans << endl; } return 0; }