Format numeric values relative to a locale. : locale « Development « C++ Tutorial

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#include <iostream>
#include <locale>
#include <iomanip>

using namespace std;

int main()
{
  // Use a fixed format with 2 decimal places.
  cout << fixed << setprecision(2);

  cout << "Default format: " << 12345678.12 << "\n\n";

  // Set the locale to English.
  locale eloc("English");
  cout.imbue(eloc);

  cout << "English format: " << 12345678.12 << "\n\n";

  locale gloc("German");
  cout.imbue(gloc);

  cout << "German format: " << 12345678.12 << "\n\n";
  return 0;
}