C++和表格格式打印
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C++ and table format printing
提问by Avinash
I am looking for how to print in C++ so that table column width is fixed.
currently I have done using spaces and |and -, but as soon as number goes to double digit all the alignment goes bad.
我正在寻找如何在 C++ 中打印，以便固定表格列宽。目前我已经使用了空格和|和-，但是一旦数字变为两位数，所有对齐都会变坏。
|---------|------------|-----------|
| NODE | ORDER | PARENT |
|---------|------------|-----------|
| 0 | 0 | |
|---------|------------|-----------|
| 1 | 7 | 7 |
|---------|------------|-----------|
| 2 | 1 | 0 |
|---------|------------|-----------|
| 3 | 5 | 5 |
|---------|------------|-----------|
| 4 | 3 | 6 |
|---------|------------|-----------|
| 5 | 4 | 4 |
|---------|------------|-----------|
| 6 | 2 | 2 |
|---------|------------|-----------|
| 7 | 6 | 4 |
|---------|------------|-----------|
回答by JoshD
You can use the std::setwmanipulator for cout.
您可以将std::setw操纵器用于 cout。
There's also a std::setfillto specify the filler, but it defaults to spaces.
还有一个std::setfill用于指定填充符，但它默认为空格。
If you want to center the values, you'll have to do a bit of calculations. I'd suggest right aligning the values because they are numbers (and it's easier).
如果要使值居中，则必须进行一些计算。我建议正确对齐这些值，因为它们是数字（而且更容易）。
cout << '|' << setw(10) << value << '|' setw(10) << value2 << '|' << endl;
Don't forget to include <iomanip>.
不要忘记包含<iomanip>.
It wouldn't be much trouble to wrap this into a general table formatter function, but I'll leave that as an exercise for the reader :)
把它包装成一个通用的表格格式化函数不会很麻烦，但我会把它留给读者作为练习:)
回答by Donotalo
You can use the beautiful printf(). I find it easier & nicer for formatting than cout.
您可以使用美丽的printf(). 我发现格式化比cout.
Examples:
例子：
int main()
{
printf ("Right align: %7d:)\n", 5);
printf ("Left align : %-7d:)\n", 5);
return 0;
}
