打印cout << '\n' 可以输出乱码吗?

Can printing cout << '\n' garble text output?

我有一个简单的程序来测试我正在编写的函数,该函数检测迷宫的文本文件是否有效。唯一允许的字符是 '0''1'' ' (space) 和 '\n'(换行符)。但是,当我使用示例文本文件执行代码时,我得到了一些奇怪的结果。在打印导入的迷宫之前,下图的第三行应显示为 "Found an illegal character [char] at [location] in maze [number]",它确实如此并且与文件匹配。

main.cpp:

#include <iostream>
#include <fstream>
#include <sstream>

using namespace std;

int main()
{
    string fileName = "Mazes/Invalid4.txt";
    string tempMaze;
    int createdMazes = 0;
    cout << "\nAttempting to open " << fileName;
    fstream thing;
    thing.open(fileName.c_str());
    if(thing.is_open())
    {
        cout << "\nHurray!";
        stringstream mazeFromFile;
        mazeFromFile << thing.rdbuf();
        tempMaze = mazeFromFile.str();
        for(int i = 0; i < tempMaze.size(); i++)
        {
            // test to make sure all characters are allowed
            if(tempMaze[i] != '1' && tempMaze[i] != '0' && tempMaze[i] != ' ' && tempMaze[i] != '\n') 
            {
                cout << "\nFound an illegal character \"" << tempMaze[i] << "\" at " << i << " in maze " << ++createdMazes << ": \n" << tempMaze;
                return 1;
            }
        }
        cout << " And with no illegal characters!\n" << tempMaze << "\nFinished printing maze\n";
        return 0;
    }

    else cout << "\nAw...\n";
    return 0;
}

文本文件是否可能没有用 '\n' 换行?这是怎么回事?

您的文本文件的行结尾很可能是 CRLF (\r\n)。当你输出 CR 时,它会将光标移动到行首。本质上,您首先要写 'Found an illegal character \"',然后将光标移动到行首并将其余部分写在行首。您需要以不同方式处理换行符以解决此问题。