22.locale.num.put.stdcxx-2.cpp

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#include <cassert>
#include <cstddef>
#include <ios>
#include <string>
#include <sstream>
 
 void test (std::streamsize prec)
{
    const std::size_t len = 0 > prec ? 7 : (1 < prec ? prec + 1 : 2);
    std::string exp (len, '0');
    exp [1] = '.';
 
    std::ostringstream strm;
    strm.setf (strm.showpoint);
    strm.precision (prec);
 
    strm << 0.0f;
    assert (exp == strm.str ());
 
    strm.str ("");
    strm << 0.0;
    assert (exp == strm.str ());
 
    strm.str ("");
    strm << 0.0L;
    assert (exp == strm.str ());
}
 
int main ()
{
    test (-2);
    test (0);
    test (1);
    test (5);
 
    return 0;
}