C++ currency output | 易学教程

问题

I am taking a C++ course right now and have completed my final assignment. However there is one thing that is bugging me:

Though I have the correct outputs for the testing on a particular output, the basepay should be 133.20 and it is displaying as 133.2. Is there a way to have this display the extra 0 rather than leaving it off?

Anyone know if it's possible and how to do it? Thank you in advance

My code is below:

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;

回答1:

use cout.precision to set precision, and fixed to toggle fixed-point mode:

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

回答2:

If you want to do it in a C++ way, and you can compile with C++11 flags, you can use the standard library:

// 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);

Example here.

What advantages have this approach?

It uses the local configuration, so the output will be coherent in any machine, even for the decimal separator, thousand separator, money symbol and decimal precission (if needed).
All the format effort is already done by the std library, less work to do!

回答3:

Yes, this is possible to do using stream manipulators. For example, set output to fixed floating-point notation, define precision (2 in your case) and define the fill character to '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;
}

In case you prefer a C-style formatting, here is an example of using printf() to achieve the same:

#include <cstdio>

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

Hope it helps. Good Luck!

回答4:

Check this out:

int main()
{
    double a = 133.2;

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

Output

133.20

回答5:

You can change the cout properties:

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

now cout << 133.2; will print 133.20

回答6:

You need to take a look at precision and 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;
}

来源：https://stackoverflow.com/questions/15327706/c-currency-output

标签

c++

floating-point

iostream

currency