列对齐问题

Question

我能够对齐列，但我的编码出现问题，我的“%”无法连接到百分比变量。

这是我的输出/对齐编码：

//HEADER
    outFile << left << setfill(' ') << setw(15) << "Member Name" 
                << setfill(' ') << setw(20) << "Portion Achieved" 
                << setfill(' ') << setw(12) << "Grade (%)" 
                << setfill(' ') << setw(15) << "Letter Grade" 
                << setfill(' ') << setw(15) << "Comment" << endl;

 while (count <= 6)
    {
    cout << "Enter Name: ";
    cin >> student.name;
    cout << "Points Achieved: ";
    cin >> student.points;
    cout << "\n";

        decimal = (student.points/60);
        percent = decimal*100;

        outFile << left << setfill(' ') << setw(15) << student.name 
                << setfill(' ') << setw(20) << decimal 
                << setfill(' ') << setw(12) << percent << " %"
                << setfill (' ') << setw(15);

这是输出的样子：

Member Name    Portion Achieved    Grade (%)   Letter Grade   Comment        
Min            0.166667            16           %F              Sorry, you did not pass :(
Carmela        0.333333            33           %F              Sorry, you did not pass :(
Jayson         0.5                 50           %F              Sorry, you did not pass :(
Kristin        0.666667            66           %D              Needs Improvement!
Mae            0.833333            83           %B              Well Done!     
JT             1                   100          %A              Excellent!  

VS 我希望它看起来如何：

    Member Name    Portion Achieved    Grade (%)   Letter Grade   Comment        
    Min            0.166667            16%         F              Sorry, you did not pass :(
    Carmela        0.333333            33%         F              Sorry, you did not pass :(
    Jayson         0.5                 50%         F              Sorry, you did not pass :(
    Kristin        0.666667            66%         D              Needs Improvement!
    Mae            0.833333            83%         B              Well Done!   
    JT             1                   100%        A              Excellent! 

Answer 1

它正在做你告诉它做的事情。整数 percent 值的“宽度”为 12 个字符。之后发生的任何事情都会发生。这里没有将任何东西“连接”在一起的代码，C++ 流中也不存在任何此类功能。

您可能必须将percent + " %"（伪代码）预先构造为一个字符串，然后将该单个字符串用作列值。也许：

<< setfill(' ') << setw(12) << (std::to_string(percent) + " %")

否则，请删除 setw 并自己写 n 个空格。为此，您需要计算出您的字符串化 percent 文本有多“长”，加 2（表示“%”）然后从 12 中减去该手数。将 std::string(n, ' ') 写入流。呸！