Problems with double precision

[ihato]

This is the code:

#include <iostream>
int main()
{
    double a=999999999; //If I add any more to this variable...
    std::cout<<a;
}

...The compiler sais: integer constant is too large for "long" type

I have read that double can reach 1e+308 not only 1e+009
But yet this is happening. Why?

[Peter87]

999999999 is an integer literal so it has the same restrictions as the largest integer type. If you add a dot it will be a double literal.

99999999999999.
99999999999999.0

[ihato]

:O
I get it now!
Thanks!