题解 | #字符串加解密#

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

int main() {
    string s1, s2;
    cin >> s1;
    cin >> s2;

    for (int i = 0; i < s1.length(); i++) {
        if (s1[i] >= 'a' && s1[i] < 'z') {
            s1[i] = s1[i] + 1 + 'A' - 'a';
        } else if (s1[i] == 'z') {
            s1[i] = 'A';
        } else if (s1[i] >= 'A' && s1[i] < 'Z') {
            s1[i] = s1[i] + 1 - ('A' - 'a');
        } else if (s1[i] == 'Z') {
            s1[i] = 'a';
        } else if (s1[i] >= '0' && s1[i] < '9') {
            s1[i] = s1[i] + 1;
        } else if (s1[i] == '9') {
            s1[i] = '0';
        }}

    for (int i = 0; i < s2.length(); i++) {
        if (s2[i] > 'a' && s2[i] <= 'z') {
            s2[i] = s2[i] - 1 + 'A' - 'a';
        } else if (s2[i] == 'a') {
            s2[i] = 'Z';
        } else if (s2[i] > 'A' && s2[i] <= 'Z') {
            s2[i] = s2[i] - 1 - ('A' - 'a');
        } else if (s2[i] == 'A') {
            s2[i] = 'z';
        } else if (s2[i] > '0' && s2[i] <= '9') {
            s2[i] = s2[i] - 1;
        } else if (s2[i] == '0') {
            s2[i] = '9';
        }
        }

    cout<<s1<<endl;
    cout<<s2<<endl;
    
    }
// 64 位输出请用 printf("%lld")