However, at the boolalpha example on this page I noticed 0 represents true and 1 represents false?

0 1 –> should be 1 0
true false
0 1 –> should be 1 0
true false

I ran the example code to be sure (my world would collapse if true was 0 :P).

Any ideas?

Thanks

It seems to me that the outputting of numbers with iostream is the worst part of C++ (and it’s not even part of C++!) The thing that really bugs me is the persistance of things like floatfield and the non-persistance of the width settings. It means that for any given output statement you’ve no idea what will be displayed unless you explicitly set everything. For example, setting output to scientific somewhere in your program means that all subsequent output will be scientific unless you explicitly say otherwise – the only way I can see to get back to the default output is to use

std::cout.unsetf(std::ios::scientific|std::ios::showpoint|std::ios::fixed);

Bring on C# (or use stdio) I say.

Anyway enough of that, there are a few typos on this page:

In the description of the floatfield group, “floatfield” is missing for showpoint.
In the floating point output examples table, for “fixed” precision 3 there are two decimal points, and for “scientific” precisions 4-6 there are no decimal points.

VS 2005 seems to have a bug regarding showpoint manipulator. The following code:

double x = 1.2345;
cout << showpoint << x << endl;
cout << scientific << x << endl;
cout << showpoint << x << endl;
cout.setf(std::ios::showpoint,std::ios::floatfield);
cout << x << endl;

produces:

1.23450
1.234500e+000
1.234500e+000
1.23450

so you need to use setf to switch from scientific to showpoint (not that I can imagine that will worry too many people!)