加密和解密生成器项目

时间：2019-03-05 11:18:53

标签： c++ encryption

我主要在做一个学校项目，遇到了问题：

  1. 每当我进入密码代码类型时，例如在主菜单中按1，它将您带到凯撒密码，然后按exit（退出）3，然后返回主菜单，按9，它会给您竖起大拇指，在竖起大拇指之后，它应该结束程序，但是发生的是，它等待另一个输入或某些东西，然后将您带回主菜单。

  2. 加密文本后的是或否选项。加密测试后，它将为您提供再次加密或解密的选项。如果答案为y，则它将清除屏幕，然后重新运行，如果答案为否，则将退出。可悲的是，它不起作用，因为我认为应该如何。发生的事情是它不断重复clearscreeen，无法继续加密或退出。

  3. 解密代码，我对如何解密回已加密的单词感到困惑。

这是完整的代码

//================================================//
//                START OF PROJECT                //
//================================================//

//================================================//
//                    LIBRARY                     //
//================================================//
#include<iostream>
#include<string>
using namespace std;

//================================================//
//                GLOBAL VARIABLES                //
//================================================//


//================================================//
//                GLOBAL FUNCTIONS                //
//================================================//
void intro();   //need more design
int menu(); //function for main menu
void thumbs();  //function for the thumbs up
void caesar();  //function for the caesar cipher
void xo();      //function for the XOR cipher
void hill();    //function for the HILL cipher
void null();    //function for the NULL cipher
void vig();     //function for the VIGENERE cipher
void bacon();   //function for the Baconian cipher
void rot();     //function for the ROT 13 cipher
void keyword(); //function for the keyword cipher
int caesarIN1();    //function within caesar cipher(Encryption)
int caesarIN2();    //function within caesar cipher(Decryption)
string encrypt();   //function on how caesar's encryption
string decrypt();   //function on how caesar's decryption


//************************************************//
//          MAIN FUNCTION OF THE SYSTEM           //
//************************************************//
int main (){
    intro();
    menu();
return 0;
}


//************************************************//
//                 INTRODUCTION                   //
//************************************************//
void intro(){
    cout<<"=======================================";
    cout<<"\n\n\t     ENCRYPTING               ";
    cout<<"\n\n\t     DECRYPTING";
    cout<<"\n\n\t   CODE GENERATOR ";
    cout<<"\n\n=======================================";
    cin.get();
}


//************************************************//
//               MAIN MENU FUNCTION               //
//************************************************//
int menu(){
        int choice;
        do{
        system("cls");
        cout<<"\n\n\n\tMAIN MENU:";
        cout<<"\n\n\t01. CAESAR CIPHER";
        cout<<"\n\n\t02. XOR CIPHER";
        cout<<"\n\n\t03. HILL CIPHER";
        cout<<"\n\n\t04. NULL CIPHER";
        cout<<"\n\n\t05. VIGENERE CIPHER";
        cout<<"\n\n\t06. BACONIAN CIPHER";
        cout<<"\n\n\t07. ROT 13 CIPHER";
        cout<<"\n\n\t08. KEYWORD CIPHER";
        cout<<"\n\n\t09. EXIT SYSTEM";
        cout<<"\n\n\tSelect Your Option(1-9): ";
        cin>>choice;
        system("cls");
            switch(choice)
            {
                case 1:
                    caesar();
                    break;
                case 2:
                    xo();
                    break;
                case 3:
                    hill();
                    break;
                case 4:
                    null();
                    break;
                case 5:
                    vig();
                    break;
                case 6:
                    bacon();
                    break;
                case 7:
                    rot();
                    break;
                case 8:
                    keyword();
                    break;
                case 9:
                    cout<<"Thanks for using the system\n\n";
                    thumbs();
                    break;
                default :
                    cout<<"INVALID INPUT\n";
                    system("pause");
                    cin.ignore();
                    cin.get();
                    menu();
                    break;
            }
        cin.ignore();
        cin.get();
    }while(choice!=9);
}

//================================================//
//             FUNCTION OF THE SYSTEM             //
//================================================//

//************************************************//
//            FUNCTION OF CAESAR CIPHER           //
//************************************************//
void caesar(){
    int choice;
    do{
    cout<<"\n\t==============================";
    cout<<"\n\t=        CAESAR CIPHER       =";
    cout<<"\n\t==============================";
    cout<<"\n\n\tCHOOSE ACTION:";
    cout<<"\n\n\t01. ENCRYPT";
    cout<<"\n\n\t02. DECRYPT";
    cout<<"\n\n\t03. EXIT";
    cout<<"\n\n\tSelect Your Option(1-3): ";
    cin>>choice;
    switch(choice)
    {
        case 1:
            caesarIN1();
            break;
        case 2:
            caesarIN2();
            break;
        case 3:
            menu();
            break;
        default :
        cout<<"INVALID INPUT\n";
        system("pause");
        caesar();
    }
    cin.ignore();
    cin.get();
    }while(choice!=3);
}

//************************************************//
//          FUNCTION WITHIN CAESAR CIPHER         //
//************************************************//
//Encryption
int caesarIN1(){
    int answer;
    do{
        system("cls");
        cout<<"\n\t==============================";
        cout<<"\n\t=        CAESAR CIPHER       =";
        cout<<"\n\t==============================";
        string encrypt(string text, int s);
        string text; 
        int s=4, y=0; 
        cout <<"\n\t ENCRYPTION";
        cin.ignore();
        cout << "\n\t Text : ";getline(cin,text);
        cout << "\t Shift: " << s; 
        cout << "\n\t Cipher: " << encrypt(text, s); 
        cout<< "\n\t Another Encryption (y/n): ";
        cin>>answer;
    }while(answer != 1);
}
//Decryption
int caesarIN2(){
    int answer;
    do{
        system("cls");
        cout<<"\n\t==============================";
        cout<<"\n\t=        CAESAR CIPHER       =";
        cout<<"\n\t==============================";
        string decrypt(string text, int s);
        string text; 
        int s=4, y=0, n=1;
        cout <<"\n\t DECRYPTION";
        cin.ignore();
        cout << "\n\t Text : ";getline(cin,text);
        cout << "\t Shift: " << s; 
        cout << "\n\t Cipher: " << decrypt(text, s); 
        cout<< "\n\t Another Decryption (y/n): ";
        cin>>answer;
    }while(answer != 1);
}

//************************************************//
//             FUNCTION OF XOR CIPHER             //
//************************************************//
void xo(){
    int choice;
    do{
    cout<<"\n\t==============================";
    cout<<"\n\t=         XOR CIPHER         =";
    cout<<"\n\t==============================";
    cout<<"\n\n\tCHOOSE ACTION:";
    cout<<"\n\n\t01. ENCRYPT";
    cout<<"\n\n\t02. DECRYPT";
    cout<<"\n\n\t03. EXIT";
    cout<<"\n\n\tSelect Your Option(1-3): ";
    cin>>choice;
    switch(choice)
    {
        case 1:
            break;
        case 2:
            break;
        case 3:
            menu();
            break;
        default :
        cout<<"INVALID INPUT\n";
        system("pause");
        caesar();
    }
    cin.ignore();
    cin.get();
    }while(choice!=3);
}

//************************************************//
//             FUNCTION OF HILL CIPHER            //
//************************************************//
void hill(){
    int choice;
    do{
    cout<<"\n\t==============================";
    cout<<"\n\t=         HILL CIPHER        =";
    cout<<"\n\t==============================";
    cout<<"\n\n\tCHOOSE ACTION:";
    cout<<"\n\n\t01. ENCRYPT";
    cout<<"\n\n\t02. DECRYPT";
    cout<<"\n\n\t03. EXIT";
    cout<<"\n\n\tSelect Your Option(1-3): ";
    cin>>choice;
    switch(choice)
    {
        case 1:
            break;
        case 2:
            break;
        case 3:
            menu();
            break;
        default :
        cout<<"INVALID INPUT\n";
        system("pause");
        caesar();
    }
    cin.ignore();
    cin.get();
    }while(choice!=3);
}

//************************************************//
//             FUNCTION OF NULL CIPHER            //
//************************************************//
void null(){
    int choice;
    do{
    cout<<"\n\t==============================";
    cout<<"\n\t=         NULL CIPHER        =";
    cout<<"\n\t==============================";
    cout<<"\n\n\tCHOOSE ACTION:";
    cout<<"\n\n\t01. ENCRYPT";
    cout<<"\n\n\t02. DECRYPT";
    cout<<"\n\n\t03. EXIT";
    cout<<"\n\n\tSelect Your Option(1-3): ";
    cin>>choice;
    switch(choice)
    {
        case 1:
            break;
        case 2:
            break;
        case 3:
            menu();
            break;
        default :
        cout<<"INVALID INPUT\n";
        system("pause");
        caesar();
    }
    cin.ignore();
    cin.get();
    }while(choice!=3);
}

//************************************************//
//           FUNCTION OF VIGENERE CIPHER          //
//************************************************//
void vig(){
    int choice;
    do{
    cout<<"\n\t==============================";
    cout<<"\n\t=       VIGENERE CIPHER      =";
    cout<<"\n\t==============================";
    cout<<"\n\n\tCHOOSE ACTION:";
    cout<<"\n\n\t01. ENCRYPT";
    cout<<"\n\n\t02. DECRYPT";
    cout<<"\n\n\t03. EXIT";
    cout<<"\n\n\tSelect Your Option(1-3): ";
    cin>>choice;
    switch(choice)
    {
        case 1:
            break;
        case 2:
            break;
        case 3:
            menu();
            break;
        default :
        cout<<"INVALID INPUT\n";
        system("pause");
        caesar();
    }
    cin.ignore();
    cin.get();
    }while(choice!=3);
}

//************************************************//
//           FUNCTION OF BACONIAN CIPHER          //
//************************************************//
void bacon(){
    int choice;
    do{
    cout<<"\n\t==============================";
    cout<<"\n\t=      BACONIAN CIPHER       =";
    cout<<"\n\t==============================";
    cout<<"\n\n\tCHOOSE ACTION:";
    cout<<"\n\n\t01. ENCRYPT";
    cout<<"\n\n\t02. DECRYPT";
    cout<<"\n\n\t03. EXIT";
    cout<<"\n\n\tSelect Your Option(1-3): ";
    cin>>choice;
    switch(choice)
    {
        case 1:
            break;
        case 2:
            break;
        case 3:
            menu();
            break;
        default :
        cout<<"INVALID INPUT\n";
        system("pause");
        caesar();
    }
    cin.ignore();
    cin.get();
    }while(choice!=3);
}

//************************************************//
//           FUNCTION OF ROT 13 CIPHER            //
//************************************************//
void rot(){
    int choice;
    do{
    cout<<"\n\t==============================";
    cout<<"\n\t==       ROT 13 CIPHER      ==";
    cout<<"\n\t==============================";
    cout<<"\n\n\tCHOOSE ACTION:";
    cout<<"\n\n\t01. ENCRYPT";
    cout<<"\n\n\t02. DECRYPT";
    cout<<"\n\n\t03. EXIT";
    cout<<"\n\n\tSelect Your Option(1-3): ";
    cin>>choice;
    switch(choice)
    {
        case 1:
            break;
        case 2:
            break;
        case 3:
            menu();
            break;
        default :
        cout<<"INVALID INPUT\n";
        system("pause");
        caesar();
    }
    cin.ignore();
    cin.get();
    }while(choice!=3);
}

//************************************************//
//           FUNCTION OF KEYWORD CIPHER           //
//************************************************//
void keyword(){
    int choice;
    do{
    cout<<"\n\t==============================";
    cout<<"\n\t=       KEYWORD CIPHER       =";
    cout<<"\n\t==============================";
    cout<<"\n\n\tCHOOSE ACTION:";
    cout<<"\n\n\t01. ENCRYPT";
    cout<<"\n\n\t02. DECRYPT";
    cout<<"\n\n\t03. EXIT";
    cout<<"\n\n\tSelect Your Option(1-3): ";
    cin>>choice;
    switch(choice)
    {
        case 1:
            break;
        case 2:
            break;
        case 3:
            menu();
            break;
        default :
        cout<<"INVALID INPUT\n";
        system("pause");
        caesar();
    }
    cin.ignore();
    cin.get();
    }while(choice!=3);
}

//************************************************//
//             FUNCTION FOR THUMBS UP             //
//************************************************//
void thumbs(){
cout<<"\t      ¶¶¶¶"<<endl;
cout<<"\t     ¶    ¶¶"<<endl;
cout<<"\t     ¶     ¶"<<endl;
cout<<"\t      ¶    ¶"<<endl;
cout<<"\t       ¶   ¶"<<endl;
cout<<"\t    ¶¶¶¶¶¶¶¶¶¶¶¶"<<endl;
cout<<"\t   ¶           ¶"<<endl;
cout<<"\t  ¶            ¶"<<endl;
cout<<"\t ¶¶   ¶¶¶¶¶¶¶¶¶¶¶"<<endl;
cout<<"\t ¶               ¶"<<endl;
cout<<"\t ¶               ¶"<<endl;
cout<<"\t  ¶   ¶¶¶¶¶¶¶¶¶¶¶"<<endl;
cout<<"\t   ¶           ¶"<<endl;
cout<<"\t    ¶          ¶"<<endl;
cout<<"\t     ¶¶¶¶¶¶¶¶¶¶"<<endl;
}

//================================================//
//        CIPHER PROCESS OF EACH FUNCTION         //
//================================================//

//************************************************//
//              CAESAR CIPHER SYSTEM              //
//************************************************//
//ENCRYPTION PROCESS
string encrypt(string text, int s) { 
    string result = ""; 

    // traverse text 
    for (int i=0;i<text.length();i++) 
    { 
        // apply transformation to each character 
        // Encrypt Uppercase letters 
        if (isupper(text[i])) 
            result += char(int(text[i]+s-65)%26 +65); 

    // Encrypt Lowercase letters 
    else
        result += char(int(text[i]+s-97)%26 +97); 
    } 

    // Return the resulting string 
    return result; 
}

//DECRYPTION
string decrypt(string text, int s) { 
    string result = ""; 

    // traverse text 
    for (int i=0;i<text.length();i++) 
    { 
        // apply transformation to each character 
        // Decrypt whitespace letters 
        if (isspace(text[i])) 
            result += char(int(text[i])); 
        // Decrypt Uppercase letters 
        else if (isupper(text[i])) 
            result += char((int(text[i]+s-65)%26 +65); 

    // Decrypt Lowercase letters 
    else
        result += char((int(text[i]+s-97)%26 +97); 
    } 

    // Return the resulting string 
    return result; 
} 

//================================================//
//                 END OF PROJECT                 //
//================================================//

2 个答案:

答案 0 :(得分：1)

我检查了以下问题的解决方法的代码

  1. 您可以检查Yunnosch提到的menu（）函数的递归调用。您也可以调用exit（EXIT_SUCCESS）;当选择选项9时，该过程将成功完成

  2. cout <<“ \ n \ t另一个加密（y / n）：”;  cin >> answer; //将答案声明为字符或使用1/0代替y / n

3.Decrypt函数应与crypto反向。如果您在加密中向前移动了4个字符，而在解密中应该向后移动了4个字符...在您的代码中，两种情况都将向前移动。

FYI编辑代码

//================================================//
//                START OF PROJECT                //
//================================================//

//================================================//
//                    LIBRARY                     //
//================================================//
#include<iostream>
#include<string>
using namespace std;

//================================================//
//                GLOBAL VARIABLES                //
//================================================//


//================================================//
//                GLOBAL FUNCTIONS                //
//================================================//
void intro();   //need more design
int menu(); //function for main menu
void thumbs();  //function for the thumbs up
void caesar();  //function for the caesar cipher
void xo();      //function for the XOR cipher
void hill();    //function for the HILL cipher
void null();    //function for the NULL cipher
void vig();     //function for the VIGENERE cipher
void bacon();   //function for the Baconian cipher
void rot();     //function for the ROT 13 cipher
void keyword(); //function for the keyword cipher
int caesarIN1();    //function within caesar cipher(Encryption)
int caesarIN2();    //function within caesar cipher(Decryption)
string encrypt();   //function on how caesar's encryption
string decrypt();   //function on how caesar's decryption


//************************************************//
//          MAIN FUNCTION OF THE SYSTEM           //
//************************************************//
int main (){
    intro();
    menu();
return 0;
}


//************************************************//
//                 INTRODUCTION                   //
//************************************************//
void intro(){
    cout<<"=======================================";
    cout<<"\n\n\t     ENCRYPTING               ";
    cout<<"\n\n\t     DECRYPTING";
    cout<<"\n\n\t   CODE GENERATOR ";
    cout<<"\n\n=======================================";
    cin.get();
}


//************************************************//
//               MAIN MENU FUNCTION               //
//************************************************//
int menu(){
        int choice;
        do{
        system("cls");
        cout<<"\n\n\n\tMAIN MENU:";
        cout<<"\n\n\t01. CAESAR CIPHER";
        cout<<"\n\n\t02. XOR CIPHER";
        cout<<"\n\n\t03. HILL CIPHER";
        cout<<"\n\n\t04. NULL CIPHER";
        cout<<"\n\n\t05. VIGENERE CIPHER";
        cout<<"\n\n\t06. BACONIAN CIPHER";
        cout<<"\n\n\t07. ROT 13 CIPHER";
        cout<<"\n\n\t08. KEYWORD CIPHER";
        cout<<"\n\n\t09. EXIT SYSTEM";
        cout<<"\n\n\tSelect Your Option(1-9): ";
        cin>>choice;
        system("cls");
            switch(choice)
            {
                case 1:
                    caesar();
                    break;
                case 2:
                    xo();
                    break;
                case 3:
                    hill();
                    break;
                case 4:
                    null();
                    break;
                case 5:
                    vig();
                    break;
                case 6:
                    bacon();
                    break;
                case 7:
                    rot();
                    break;
                case 8:
                    keyword();
                    break;
                case 9:
                    cout<<"Thanks for using the system\n\n";
                    thumbs();
                    exit(0);

                default :
                    cout<<"INVALID INPUT\n";
                    system("pause");
                    cin.ignore();
                    cin.get();
                    menu();
                    break;
            }

    }while(choice!=9);
    return 0;
}

//================================================//
//             FUNCTION OF THE SYSTEM             //
//================================================//

//************************************************//
//            FUNCTION OF CAESAR CIPHER           //
//************************************************//
void caesar(){
    int choice;
    do{
    cout<<"\n\t==============================";
    cout<<"\n\t=        CAESAR CIPHER       =";
    cout<<"\n\t==============================";
    cout<<"\n\n\tCHOOSE ACTION:";
    cout<<"\n\n\t01. ENCRYPT";
    cout<<"\n\n\t02. DECRYPT";
    cout<<"\n\n\t03. EXIT";
    cout<<"\n\n\tSelect Your Option(1-3): ";
    cin>>choice;
    switch(choice)
    {
        case 1:
            caesarIN1();
            break;
        case 2:
            caesarIN2();
            break;
        case 3:
            menu();
            break;
        default :
        cout<<"INVALID INPUT\n";
        system("pause");
        caesar();
    }

    }while(choice!=3);
}

//************************************************//
//          FUNCTION WITHIN CAESAR CIPHER         //
//************************************************//
//Encryption
int caesarIN1(){
    int answer;
    do{
        system("cls");
        cout<<"\n\t==============================";
        cout<<"\n\t=        CAESAR CIPHER       =";
        cout<<"\n\t==============================";
        string encrypt(string text, int s);
        string text; 
        int s=4, y=0; 
        cout <<"\n\t ENCRYPTION";
        cin.ignore();
        cout << "\n\t Text : ";getline(cin,text);
        cout << "\t Shift: " << s; 
        cout << "\n\t Cipher: " << encrypt(text, s); 
        cout<< "\n\t Another Encryption (y/n): ";
        cin>>answer; // either use 1/0  or make answer as char
    }while(answer != 1);
    return 0;
}
//Decryption
int caesarIN2(){
    int answer;
    do{
        system("cls");
        cout<<"\n\t==============================";
        cout<<"\n\t=        CAESAR CIPHER       =";
        cout<<"\n\t==============================";
        string decrypt(string text, int s);
        string text; 
        int s=4, y=0, n=1;
        cout <<"\n\t DECRYPTION";
        cin.ignore();
        cout << "\n\t Text : ";getline(cin,text);
        cout << "\t Shift: " << s; 
        cout << "\n\t Cipher: " << decrypt(text, s); 
        cout<< "\n\t Another Decryption (y/n): ";
        cin>>answer;
    }while(answer != 1);
    return 0;
}

//************************************************//
//             FUNCTION OF XOR CIPHER             //
//************************************************//
void xo(){
    int choice;
    do{
    cout<<"\n\t==============================";
    cout<<"\n\t=         XOR CIPHER         =";
    cout<<"\n\t==============================";
    cout<<"\n\n\tCHOOSE ACTION:";
    cout<<"\n\n\t01. ENCRYPT";
    cout<<"\n\n\t02. DECRYPT";
    cout<<"\n\n\t03. EXIT";
    cout<<"\n\n\tSelect Your Option(1-3): ";
    cin>>choice;
    switch(choice)
    {
        case 1:
            break;
        case 2:
            break;
        case 3:
            menu();
            break;
        default :
        cout<<"INVALID INPUT\n";
        system("pause");
        caesar();
    }

    }while(choice!=3);
}

//************************************************//
//             FUNCTION OF HILL CIPHER            //
//************************************************//
void hill(){
    int choice;
    do{
    cout<<"\n\t==============================";
    cout<<"\n\t=         HILL CIPHER        =";
    cout<<"\n\t==============================";
    cout<<"\n\n\tCHOOSE ACTION:";
    cout<<"\n\n\t01. ENCRYPT";
    cout<<"\n\n\t02. DECRYPT";
    cout<<"\n\n\t03. EXIT";
    cout<<"\n\n\tSelect Your Option(1-3): ";
    cin>>choice;
    switch(choice)
    {
        case 1:
            break;
        case 2:
            break;
        case 3:
            menu();
            break;
        default :
        cout<<"INVALID INPUT\n";
        system("pause");
        caesar();
    }

    }while(choice!=3);
}

//************************************************//
//             FUNCTION OF NULL CIPHER            //
//************************************************//
void null(){
    int choice;
    do{
    cout<<"\n\t==============================";
    cout<<"\n\t=         NULL CIPHER        =";
    cout<<"\n\t==============================";
    cout<<"\n\n\tCHOOSE ACTION:";
    cout<<"\n\n\t01. ENCRYPT";
    cout<<"\n\n\t02. DECRYPT";
    cout<<"\n\n\t03. EXIT";
    cout<<"\n\n\tSelect Your Option(1-3): ";
    cin>>choice;
    switch(choice)
    {
        case 1:
            break;
        case 2:
            break;
        case 3:
            menu();
            break;
        default :
        cout<<"INVALID INPUT\n";
        system("pause");
        caesar();
    }
    cin.get();
    }while(choice!=3);
}

//************************************************//
//           FUNCTION OF VIGENERE CIPHER          //
//************************************************//
void vig(){
    int choice;
    do{
    cout<<"\n\t==============================";
    cout<<"\n\t=       VIGENERE CIPHER      =";
    cout<<"\n\t==============================";
    cout<<"\n\n\tCHOOSE ACTION:";
    cout<<"\n\n\t01. ENCRYPT";
    cout<<"\n\n\t02. DECRYPT";
    cout<<"\n\n\t03. EXIT";
    cout<<"\n\n\tSelect Your Option(1-3): ";
    cin>>choice;
    switch(choice)
    {
        case 1:
            break;
        case 2:
            break;
        case 3:
            menu();
            break;
        default :
        cout<<"INVALID INPUT\n";
        system("pause");
        caesar();
    }

    }while(choice!=3);
}

//************************************************//
//           FUNCTION OF BACONIAN CIPHER          //
//************************************************//
void bacon(){
    int choice;
    do{
    cout<<"\n\t==============================";
    cout<<"\n\t=      BACONIAN CIPHER       =";
    cout<<"\n\t==============================";
    cout<<"\n\n\tCHOOSE ACTION:";
    cout<<"\n\n\t01. ENCRYPT";
    cout<<"\n\n\t02. DECRYPT";
    cout<<"\n\n\t03. EXIT";
    cout<<"\n\n\tSelect Your Option(1-3): ";
    cin>>choice;
    switch(choice)
    {
        case 1:
            break;
        case 2:
            break;
        case 3:
            menu();
            break;
        default :
        cout<<"INVALID INPUT\n";
        system("pause");
        caesar();
    }

    }while(choice!=3);
}

//************************************************//
//           FUNCTION OF ROT 13 CIPHER            //
//************************************************//
void rot(){
    int choice;
    do{
    cout<<"\n\t==============================";
    cout<<"\n\t==       ROT 13 CIPHER      ==";
    cout<<"\n\t==============================";
    cout<<"\n\n\tCHOOSE ACTION:";
    cout<<"\n\n\t01. ENCRYPT";
    cout<<"\n\n\t02. DECRYPT";
    cout<<"\n\n\t03. EXIT";
    cout<<"\n\n\tSelect Your Option(1-3): ";
    cin>>choice;
    switch(choice)
    {
        case 1:
            break;
        case 2:
            break;
        case 3:
            menu();
            break;
        default :
        cout<<"INVALID INPUT\n";
        system("pause");
        caesar();
    }

    }while(choice!=3);
}

//************************************************//
//           FUNCTION OF KEYWORD CIPHER           //
//************************************************//
void keyword(){
    int choice;
    do{
    cout<<"\n\t==============================";
    cout<<"\n\t=       KEYWORD CIPHER       =";
    cout<<"\n\t==============================";
    cout<<"\n\n\tCHOOSE ACTION:";
    cout<<"\n\n\t01. ENCRYPT";
    cout<<"\n\n\t02. DECRYPT";
    cout<<"\n\n\t03. EXIT";
    cout<<"\n\n\tSelect Your Option(1-3): ";
    cin>>choice;
    switch(choice)
    {
        case 1:
            break;
        case 2:
            break;
        case 3:
            menu();
            break;
        default :
        cout<<"INVALID INPUT\n";
        system("pause");
        caesar();
    }

    }while(choice!=3);
}

//************************************************//
//             FUNCTION FOR THUMBS UP             //
//************************************************//
void thumbs(){
cout<<"\t      ¶¶¶¶"<<endl;
cout<<"\t     ¶    ¶¶"<<endl;
cout<<"\t     ¶     ¶"<<endl;
cout<<"\t      ¶    ¶"<<endl;
cout<<"\t       ¶   ¶"<<endl;
cout<<"\t    ¶¶¶¶¶¶¶¶¶¶¶¶"<<endl;
cout<<"\t   ¶           ¶"<<endl;
cout<<"\t  ¶            ¶"<<endl;
cout<<"\t ¶¶   ¶¶¶¶¶¶¶¶¶¶¶"<<endl;
cout<<"\t ¶               ¶"<<endl;
cout<<"\t ¶               ¶"<<endl;
cout<<"\t  ¶   ¶¶¶¶¶¶¶¶¶¶¶"<<endl;
cout<<"\t   ¶           ¶"<<endl;
cout<<"\t    ¶          ¶"<<endl;
cout<<"\t     ¶¶¶¶¶¶¶¶¶¶"<<endl;
}

//================================================//
//        CIPHER PROCESS OF EACH FUNCTION         //
//================================================//

//************************************************//
//              CAESAR CIPHER SYSTEM              //
//************************************************//
//ENCRYPTION PROCESS
string encrypt(string text, int s) { 
    string result = ""; 

    // traverse text 
    for (int i=0;i<text.length();i++) 
    { 
        // apply transformation to each character 
        // Encrypt Uppercase letters 
        if (isupper(text[i])) 
            result += char(int(text[i]+s-65)%26 +65); 

    // Encrypt Lowercase letters 
    else
        result += char(int(text[i]+s-97)%26 +97); 
    } 

    // Return the resulting string 
    return result; 
}

//DECRYPTION
string decrypt(string text, int s) { 
    string result = ""; 

    // traverse text 
    for (int i=0;i<text.length();i++) 
    { 
        // apply transformation to each character 
        // Decrypt whitespace letters 
        if (isspace(text[i])) 
            result += char(int(text[i])); 
        // Decrypt Uppercase letters 
        else if (isupper(text[i])) 
            result += char((int(text[i] - s-65)%26 +65)); 

    // Decrypt Lowercase letters 
    else
        result += char((int(text[i] - s-97)%26 +97)); 
    } 

    // Return the resulting string 
    return result; 
} 

//================================================//
//                 END OF PROJECT                 //
//================================================//

答案 1 :(得分：0)

您正在递归调用menu()，这导致观察到的异常行为。
如果您在任何菜单中，除了main()内的根目录之外，然后输入“ 9”退出，只会使您进入较浅级别的递归菜单。
这与您观察到的不良行为相符。

要解决此问题，只需确保您只有menu()内部的每个呼叫main()。
必须通过保留任何子功能并从do {} while返回单个菜单中的main()来覆盖“我再次想要菜单”的所有其他情况。
这样，任何“ 9”将使您退出菜单循环的这一层，退出功能menu()（直接从main()调用，无其他地方），从而到达程序结尾。

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