如何在C ++ Visual Studio 2008中保持double的精度

Question

main()
{
   double d1 = 1234.1;
   cout << "d1 = 1234.1 --> " << d1 << endl;
   double d2 = 1234.099999;
   cout << "d2 = 1234.099999 --> " << d2 << endl;
}

Output:

d1 = 1234.1 --> 1234.1
d2 = 1234.099999 --> 1234.1

How can I get the exact value for d2 ? Please suggest.

Answer 1

Try

cout.precision(<number of digits after comma>);

like

cout.precision(5);

before output statement.