题解 | #字符串加解密#

#include <cctype>
#include <iostream>
using namespace std;

int main() {
    string s;
    while (getline(cin,s)) { // 注意 while 处理多个 case
        for(int i = 0;i<s.size();i++){
            if(s[i]>='a'&&s[i]<='y'){
                s[i] = toupper(s[i]+1);
                continue;
            }if(s[i]>='A'&&s[i]<='Y'){
                s[i] = tolower(s[i]+1);
                continue;
            }if(s[i]=='z'){
                s[i] = 'A';
                continue;
            }if(s[i]=='Z'){
                s[i] = 'a';
                continue;
            }
            if(s[i]>='0'&&s[i]<='8'){
                s[i] = toupper(s[i]+1);
                continue;
            }if(s[i]=='9'){
                s[i] = '0';
                continue;
            }
        }
        cout<<s<<endl;
        s.clear();
        getline(cin,s);
        for(int i = 0;i<s.size();i++){
            if(s[i]>='b'&&s[i]<='z'){
                s[i] = toupper(s[i]-1);
                continue;
            }if(s[i]>='B'&&s[i]<='Z'){
                s[i] = tolower(s[i]-1);
                continue;
            }if(s[i]=='a'){
                s[i] = 'Z';
                continue;
            }if(s[i]=='A'){
                s[i] = 'z';
                continue;
            }
            if(s[i]>='1'&&s[i]<='9'){
                s[i] = toupper(s[i]-1);
                continue;
            }if(s[i]=='0'){
                s[i] = '9';
                continue;
            }
        }
        cout<<s<<endl;
        s.clear();
    }
}
// 64 位输出请用 printf("%lld")