Syntax for printing commas in numerics

[Tester84]

I've got a program I need a mortgage table printed as an output and I'm struggling with the syntax for printing commas in the digits(ex. 20,000 instead of 20000).

cin >> prin;

if (prin == 20,000)
{
     cout << myTable << endl;
}

Not only do i need it to print in the table will it matter if its the user input for prin? Thanks for any and all help!

[Vexer]

So, you are trying to insert commas into the numbers, then print them?

[PanGalactic]

Typically you need to imbue the stream with a locale that automatically does that for you.

For example, on Linux, my locale is en_US.UTF-8.

If I do:

#include <iostream>
#include <locale>

int main()
{
    const int x = 1000000;
    std::cout.imbue(std::locale(""));
    std::cout << x << std::endl;
    return 0;
}

The nice thing about this is that it formats the number properly for whatever locale is appropriate for the user.

I get:

$ ./locale_test 
1,000,000

A German might see this:

$ LANG=de_DE.UTF-8 ./locale_test 
1.000.000

[Duthomhas]

That works fine on Linux, but locale support is typically broken on Windows. MinGW users must use STLPort or some other standard library to get C++ locale support of any kind.

[PanGalactic]

The code works just fine with VS2010.