Question

嘿伙计我这里有一个程序基本上需要一个密钥来打开加密数据但由于某种原因，每次我将Ascii数字转换为字符时运行程序我得到的字符具有错误的Ascii值。例如，在下面的代码中，如果它尝试将Ascii Value '50'转换为char，我会得到'e'而不是'2'。任何帮助将非常感激。

    #include "stdafx.h"
    #include "iostream"
    #include "string"
    #include <cstdlib>
    #include <ctime>
    #include <algorithm>

    using namespace std;

    string key = "5053525055";
    int asciiValues;
    char asciiChars;
    for (int i = 0; i < key.length(); i += 2)
    {
        asciiValues = (int)(key[i] + key[i + 1]);
        asciiChars = (int)(key[i] + key[i + 1]);
    }

以下是感兴趣的人的完整代码。

    #include "stdafx.h"
    #include "iostream"
    #include "string"
    #include <cstdlib>
    #include <ctime>
    #include <algorithm>

    using namespace std;

    void encryption(string text)
    {
        char asciiChar;
        int asciiValue = 0;
        string key;
        string encoded;
        srand((unsigned)time(0));
        int random_integer = rand();
        cout << random_integer << endl;
        //Creates the key for the string.
        for (int i = 0; i < to_string(random_integer).length(); i++)
        {
           int asciiValue = (char)(to_string(random_integer)[i]);
           key = key + to_string(asciiValue);
           cout << asciiValue << endl;
        }
        int help = to_string(asciiValue).length();
        /*Function that converts the individual characters in the input
        string to AsciiValues and then puts them into the encoded data.*/
        for (int i = 0; i < text.length(); i++)
        {
            int asciiValue = char(text[i]) + random_integer;
            encoded = encoded + to_string(asciiValue) + ".";
        }

     cout << "Encrypted data: " << encoded << endl;
     cout << "Your key for this encoded data is " << key << endl;
    }

    void decryption(string text, string key)
    {
    char asciiChars;
    int asciiValues;
    int number;
    string qkey;
    string decoded;
    /*for (int i = 0; i < to_string(random_integer).length(); i++)
    {
        int asciiValue = (char)(to_string(random_integer)[i]);
        key = key + to_string(asciiValue);
        cout << asciiValue << endl;
    }*/
    for (int i = 0; i < key.length(); i += 2)
    {
        asciiValues = (int)(key[i] + key[i + 1]);
        asciiChars = (int)(key[i] + key[i + 1]);
        number = asciiChars - '0';
        cout << number << endl;
    }
    cin >> qkey;
    }


    int main()
    {
    string answer;
    int question = 0;
    string vkey;
    ask:
    cout << "Would you like to:\nEncrypt Data[1]\nDecrypt Data[2]\nExit[3]" << 
    endl;

    cin >> question;
    if (to_string(question) != "1"&&to_string(question) != 
    "2"&&to_string(question) != "3")
    {
        goto ask;
    }
    else if (to_string(question) == "1")
    {
        while (answer.length() > 1000 || answer.length() < 1)
    {
        cout << "Please enter a string that has a length of 1 to 1000 
        characters. ";
        cin >> answer;
        cout << endl;
    }
    encryption(answer);
    cin >> answer;
    goto ask;
    }
    else if (to_string(question) == "2")
    {
        cout << "Please enter the string you would like decrypted. ";
        cin >> answer;
        cout << endl;
        cout << "Now please enter the key for the string. ";
        cin >> vkey;
        cout << endl;
        decryption(answer, vkey);
     }

return 0;

}

Answer 1

ASCII数字字符从30hex（或48dec）开始。因此＆＃39; 0＆＃39; 0 = 30hex。因此，要获得ASCII字符，您必须添加＆＃39; 0＆＃39; 0 （30H）。

'cout << 5 + '0'; // 53dec (35hex)

将Ascii字符转换为整数

1 个答案: