为什么 setw(n) 在这里不起作用？
Why doesn't setw(n) work here?
这是我的问题：
Given three variables, a, b, c, of type double that have already been declared and initialized, write some code that prints each of them in a 15 position field on the same line, in such away that scientific (or e-notation or exponential notation) is avoided. Each number should be printed with 5 digits to the right of the decimal point. For example, if their values were 24.014268319, 14309, 0.00937608, the output would be:
|xxxxxxx24.01427xxxx14309.00000xxxxxxxx0.00938
NOTE: The vertical bar, | , on the left above represents the left edge of the print area; it is not to be printed out. Also, we show x in the output above to represent spaces-- your output should not actually have x's!
这实际上是我想要做的事情：
cout << fixed << setprecision(5) << 24.014268319 << setw(5) << 5252.25151516 << endl;
但这会产生以下输出：
24.014275252.25152
显然我没有解释如何正确使用 setw(n)，有人看到我在这里做错了什么吗？
setw(...) I/O 操纵器有点棘手，因为它的效果正在重置，即宽度设置回零，在每次调用 << 之后（在documentation).
中描述的其他内容
您需要多次调用setw(15)，如下所示：
cout << fixed << setprecision(5) << setw(15) << 24.014268319 << setw(15) << 5252.25151516 << endl;
这是我的问题：
Given three variables, a, b, c, of type double that have already been declared and initialized, write some code that prints each of them in a 15 position field on the same line, in such away that scientific (or e-notation or exponential notation) is avoided. Each number should be printed with 5 digits to the right of the decimal point. For example, if their values were 24.014268319, 14309, 0.00937608, the output would be:
|xxxxxxx24.01427xxxx14309.00000xxxxxxxx0.00938
NOTE: The vertical bar, | , on the left above represents the left edge of the print area; it is not to be printed out. Also, we show x in the output above to represent spaces-- your output should not actually have x's!
这实际上是我想要做的事情：
cout << fixed << setprecision(5) << 24.014268319 << setw(5) << 5252.25151516 << endl;
但这会产生以下输出：
24.014275252.25152
显然我没有解释如何正确使用 setw(n)，有人看到我在这里做错了什么吗？
setw(...) I/O 操纵器有点棘手，因为它的效果正在重置，即宽度设置回零，在每次调用 << 之后（在documentation).
您需要多次调用setw(15)，如下所示：
cout << fixed << setprecision(5) << setw(15) << 24.014268319 << setw(15) << 5252.25151516 << endl;