Question

我正在参加C ++课程，并完成了我的最终作业。然而，有一件事让我烦恼：

虽然我对特定输出的测试有正确的输出，但basepay应为133.20，并显示为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？提前谢谢

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

如果你想用C ++方式做，和你可以用C ++ 11标志编译，你可以使用标准库：

// 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);

示例here。

这种方法有哪些优势？

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

是的，这可以使用stream manipulators。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()来实现同样的例子：

#include <cstdio>

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

希望它有所帮助。祝你好运！

Answer 3

使用cout.precision设置精度，fixed切换定点模式：

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

Answer 4

您可以更改cout属性：

cout.setf(ios::fixed);
cout.precision(2);`

现在cout << 133.2;将打印133.20

Answer 5

检查出来：

int main()
{
    double a = 133.2;

    cout << fixed << setprecision(2) << a << endl;
}

输出

133.20

Answer 6

您需要查看precision和fixed。

#include <iostream>

int main()
{
    double f = 133.20;

    // default
    std::cout << f << std::endl;

    // precision and fixed-point specified
    std::cout.precision(2);
    std::cout << std::fixed << f << std::endl;

    return 0;
}

C ++货币输出

6 个答案: