实现Caesar密码（加法密码）加解密

1.加密过程的明文和密钥可以是任意按键输入的小写英文字母；解密过程的密文和密钥可以是任意按键输入的小写字母
2.给出.cpp文件源代码和加解密结果

#include<iostream>using namespace std;void main(){    int k;    char c;    int m,n;    char s[2];    int j=0;    cout<<"请输入您的选择\n加密单一字符请选1，解密单一字符请选2\n，加密字符串请选3，解密字符串请选4\n";    cin>>m;    switch(m){        case 1:            cout<<"请输入加密的字符c：\n";            cin>>c;                     cout<<"请输入密钥k：\n";            cin>>k;            cout<<"该字符加密为：\n";            c=c+k;            cout<<c<<endl;                      break;        case 2:            cout<<"请输入解密的字符c：\n";            cin>>c;                     cout<<"请输入密钥k：\n";            cin>>k;            cout<<"该字符加密为：\n";            c=c-k;            cout<<c<<endl;                      break;        case 3:            cout<<"请输入字符串长度：n"<<endl;            cin>>n;            cout<<"请输入加密的字符c\n";            for(j=0;j<n;j++){                cin>>s[j];      }                cout<<"请输入密钥k：\n";                cin>>k;                cout<<"该字符加密为：\n";                    for(j=0;j<n;j++){                        s[j]+=k;                        cout<<s[j];                    }                    cout<<"\n";            break;        case 4:            cout<<"请输入字符串长度：n"<<endl;            cin>>n;            cout<<"请输入解密的字符c：\n";            for(j=0;j<n;j++){                cin>>s[j];      }                cout<<"请输入密钥k：\n";                cin>>k;                cout<<"该字符解密为：\n";                    for(j=0;j<n;j++){                        s[j]+=k;                        cout<<s[j];                    }                    cout<<"\n";            break;        default:           cout<<"err";            break;    }   }

运行结果：