题解 | #字符串加解密#C++

按要求一步一步

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

int main() {
    string s1, s2;
    while(cin >> s1 >> s2) {
        int len1 = s1.size();
        int len2 = s2.size();
        // 先处理s1
        for (int i = 0; i < len1; ++i) {
            if (s1[i] >= 'a' && s1[i] < 'z') {
                s1[i] = s1[i] - 'a' + 'A' + 1;
                continue;
            } else if (s1[i] == 'z') {
                s1[i] = 'A';
                continue;
            } else if (s1[i] >= 'A' && s1[i] < 'Z') {
                s1[i] = s1[i] - 'A' + 'a' + 1;
                continue;
            } else if (s1[i] == 'Z') {
                s1[i] = 'a';
                continue;
            } else if (s1[i] >= '0' && s1[i] < '9') {
                s1[i] = s1[i] + 1;
                continue;
            } else if (s1[i] == '9') {
                s1[i] = '0';
                continue;
            }

        }
        cout << s1 << endl;

        // 再处理s2
        for (int i = 0; i < len2; ++i) {
            if (s2[i] > 'a' && s2[i] <= 'z') {
                s2[i] = s2[i] - 'a' + 'A' - 1;
                continue;
            } else if (s2[i] == 'a') {
                s2[i] = 'Z';
                continue;
            } else if (s2[i] > 'A' && s2[i] <= 'Z') {
                s2[i] = s2[i] - 'A' + 'a' - 1;
                continue;
            } else if (s2[i] == 'A') {
                s2[i] = 'z';
                continue;
            } else if (s2[i] > '0' && s2[i] <= '9') {
                s2[i] = s2[i] - 1;
                continue;
            } else if (s2[i] == '0') {
                s2[i] = '9';
                continue;
            }

        }
        cout << s2 << endl;


    }

    return 0;
}