基本做法是首先使各栏具有更大的灵活性,减少硬编码。 与此类似:

const int MAX_COLUMNS = 6;

struct {
    const char* name;
    int width;
} columns[MAX_COLUMNS] = {
    { "Stock", 6 },
    { "Name", 16 },
    { "Value", 10 },
    { "Quantity", 10 },
    { NULL },                 // Don t care
    { "Total Worth", 12 },
};

然后,你可以轻松地输出你的栏目如下:

    // Print column headings
    cout << left;
    for (int i = 0; i < MAX_COLUMNS; i++)
    {
        if (columns[i].name)
        {
            cout << setw(columns[i].width) << columns[i].name;
        }
    }
    cout << endl;

关于实际数据,请将first改为整个线,然后使用>。 a. 区分该行的内容:

    // Read and process lines
    string line;
    while (getline(myfile, line))
    {
        istringstream iss(line);
        string item;
        int count = 0;
        while (count < MAX_COLUMNS && getline(iss, item,  ~ ))
        {
            if (columns[count].name)
            {
                cout << setw(columns[count].width) << item;
            }
            ++count;
        }
        cout << endl;
    }

产出:

Stock Name            Value     Quantity  Total Worth 
AMZN  Amazon.Com Inc  1402.05   +24.10    4854900     
AAPL  Apple Inc       171.51    +0.40     39128000    

如果你需要以不同顺序显示你的栏目,那么你可以首先将数值分为<条码>查询和设计;指示和编号;,然后按你想要的顺序计算。

我正在使用<条码>植被线(Mfile,line1[a], ~ );,按<条码> ~进行分离,我无法就此进一步分裂。

The problem is not splitting the input lines. As was pointed out in the comments that is working fine.

问题是产出格式。 当你展示头衔时,你对每个领域使用不同的宽度。 此外,你在每一个外地名称之后添加了婚礼,这实际上导致职能<条码>tw<>>>>>/条码规定的宽度被忽略。

cout
    << left
    << setw(10)
    << "Stock Name              "   // Wider than 10
    << left
    << setw(5)
    << " Value  "                   // Wider than 5
    << left
    << setw(8)
    << "Quantity   "                // Wider than 8
    << left
    << setw(5)
    << "   Total Worth  "           // Wider than 5
    << endl;

之后,当你得出实地价值时,你使用单一宽度:

cout
    << left
    << setw(10);

It should not surprise you that the columns do not line up.

Read one record at a time

打上栏的最容易的方法是排除所有胎盘,并使用<代码>std:setw控制 w栏。

I recommend reading each line (i.e., record) into a string, and then using a stringstream to further parse it:

    std::string line;
    while (std::getline(myfile, line))    // Keep looping while you read a line successfully.
    {
        std::stringstream sst{ line };    // Load the line into a `stringstream`.
        // ...
    }

Use named fields

Using named fields makes it easier to keep track of the ones you want to output.

// If your course has covered `struct`, you can place 
// these fields within a `struct`.

std::string ticker_symbol;
std::string stock_name;
std::string value;
std::string quantity;
std::string percent_change;
std::string unknown_field1;
std::string total_worth;
std::string trade_date;
std::string unknown_field2;

Read each field separately

// Use an if-statement to verify that each of the fields 
// was successfully extracted from the `stringstream`.

if (std::getline(sst, ticker_symbol,  ~ ) &&
    std::getline(sst, stock_name,  ~ ) &&
    std::getline(sst, value,  ~ ) &&
    std::getline(sst, quantity,  ~ ) &&
    std::getline(sst, percent_change,  ~ ) &&
    std::getline(sst, unknown_field1,  ~ ) &&
    std::getline(sst, total_worth,  ~ ) &&
    std::getline(sst, trade_date,  ~ ) &&
    std::getline(sst, unknown_field2))  // no  ~  here.
{
    // Extraction successful. Output the fields you need, 
    // followed by `std::endl` (or  
 ). Use `std::setw` 
    // to set a separate width for each field.
}
else
{
    // Extraction failed. Output an error message.
}

You will need to fiddle with the widths to get the columns to line up.

由于这似乎属于某种家务劳动,我把细节留给你。