c++ - 比较两个 vector 可能会给我一个错误

Question

所以这背后的想法是用户输入一条消息，然后消息被翻译成摩尔斯电码。这是我今天已经完成了 8 个多小时的家庭作业。这也是我第一次认真地与类(class)打交道。

运行时，我在第 64 行只收到一个错误。我收到的错误没有任何意义(而且它是 huuuuge，所以我不想包括它，除非被问到)。我怀疑问题是 originalMessage vector 和 alphaCode vector 是不同的 vector 类型(分别是字符串和字符)。

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

class Code
{
    private:
        vector<char> alphaCode;
        vector<string> morseCode;
        vector<string> originalMessage;
        vector<string> finalMessage;
    public:
        Code();
        void encoder(vector<string> input);
        void display();
};

Code::Code():alphaCode(), morseCode(28)
{
    //Building alphaCode
    for (char c='A'; c<='Z'; c++) alphaCode.push_back(c);
    alphaCode.push_back(' ');
    alphaCode.push_back('.');

    //Building morseCode
    morseCode[0] =".-";
    morseCode[1] ="-...";
    morseCode[2] ="-.-.";
    morseCode[3] ="-..";
    morseCode[4] =".";
    morseCode[5] ="..-.";
    morseCode[6] ="--.";
    morseCode[7] ="....";
    morseCode[8] ="..";
    morseCode[9] =".---";
    morseCode[10] ="-.-";
    morseCode[11] =".-..";
    morseCode[12] ="--";
    morseCode[13] ="-.";
    morseCode[14] ="---";
    morseCode[15] =".--.";
    morseCode[16] ="--.--";
    morseCode[17] =".-.";
    morseCode[18] ="...";
    morseCode[19] ="-";
    morseCode[20] ="..-";
    morseCode[21] ="...-";
    morseCode[22] =".--";
    morseCode[23] ="-..-";
    morseCode[24] ="-.--";
    morseCode[25] ="--..";
    morseCode[26] =".......";
    morseCode[27] ="x";
}

void Code::encoder(vector<string> input)
{
    originalMessage = input;
    for (int i = 0; i < originalMessage.size(); i++)
    {
        for (int j = 0; j < alphaCode.size(); j++)
        {
            if (originalMessage[i] == alphaCode[j])
            {
                finalMessage.push_back(morseCode[j]);
                finalMessage.push_back(" ");
            }
        }
    }
}

void Code::display()
{
    for (int x; x < finalMessage.size(); x++) cout << finalMessage[x];
}

//------------------------------------------------------------------------------

int main()
{
    vector<string> message;
    string temp;

    cout << "Input:" << endl;
    cin >> temp;
    message.push_back(temp);

    Code c1;
    c1.encoder(message);
    c1.display();

}

Answer 1

您的源代码中有几个问题。第一个问题是消息变量:

vector<string> message;

可以改为:

string message;

并根据此更改更改代码的其他部分。

第二个问题回到

for (int x; x < finalMessage.size(); x++) cout << finalMessage[x];

变量 x 没有被初始化，初始化它或者像这样写一个更好的循环:

for (const auto& x : finalMessage) cout << x;