C++货币输出

Question

我现在正在参加C++课程并完成了我的最终任务.然而,有一件事让我烦恼:

虽然我对测试正确的输出上的特定输出时,basepay应该是133.20,它会显示为133.2.有没有办法让这个显示额外的0而不是让它关闭？

任何人都知道它是否可能以及如何做到这一点？先感谢您

我的代码如下:

cout<< "Base Pay .................. = " << basepay << endl;
cout<< "Hours in Overtime ......... = " << overtime_hours << endl;
cout<< "Overtime Pay Amount........ = " << overtime_extra << endl;
cout<< "Total Pay ................. = " << iIndividualSalary << endl;
cout<< endl;

cout<< "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%" <<endl;
cout<< "%%%% EMPLOYEE SUMMARY DATA%%%%%%%%%%%%%%%%%%%%%%%" <<endl;
cout<< "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%" <<endl;
cout<< "%%%% Total Employee Salaries ..... = " << iTotal_salaries <<endl;
cout<< "%%%% Total Employee Hours ........ = " << iTotal_hours <<endl;
cout<< "%%%% Total Overtime Hours......... = " << iTotal_OvertimeHours <<endl;
cout<< "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%" << endl;
cout<< "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%" << endl;

Answer 1

如果您想以C++方式进行,并且可以使用C++ 11标志进行编译,则可以使用标准库:

// Note: the value in cents!
const int basepay = 10000;

// Create a stream and imbue it with the local configuration.
std::stringstream ss;
ss.imbue(std::locale(""));

// The stream contains $100.00 (assuming a en_US locale config)
ss << std::showbase << std::put_money(basepay);

这里的例子.

这种方法有哪些优点？

• 它使用本地配置,因此输出将在任何机器中保持一致,即使是小数分隔符,千位分隔符,货币符号和十进制精度(如果需要).
• 所有格式化工作都已由std库完成,减少了工作量!

Answer 2

使用cout.precision设置精度，并使用fixed切换定点模式：

cout.precision(2);
cout<< "Base Pay .................. = " << fixed << basepay << endl;

Answer 3

是的,这可以使用流操纵器.例如,将输出设置为固定浮点表示法,定义精度(在您的情况下为2)并将填充字符定义为"0":

#include <iostream>
#include <iomanip>

int main()
{
    double px = 133.20;
    std::cout << "Price: "
              << std::fixed << std::setprecision(2) << std::setfill('0')
              << px << std::endl;
}

如果你喜欢C风格的格式,这里有一个使用printf()实现相同的例子:

#include <cstdio>

int main()
{
    double px = 133.20;
    std::printf("Price: %.02f\n", px);
}

希望能帮助到你.祝好运!