setting and resetting stream precision

[john smith]

Hi, I would like to save a stream's output precision and then change the
precision and then restore it. One example I found was using
ios_base::fixed , and ios_base::float field. But on my machine this only
gives 6 or 8 digits after the decimal. I would like at least 12. If I do
cout.precision( 12), then cout is forever set to 12 precisions from that
point on. I guess I can call cout.precision( 4) when I'm done, but how do I
know that 4 is the default?

example:
ios_base::fmtfl ags f = cout.flags();
cout.setf(ios_b ase::fixed, ios_base::float field);
cout << 12.512312312312 312312312312312 3 << endl;
cout.flags(f);
cout << 12.512312312312 312312312312312 3 << endl;

Thanks in advance.

[tom_usenet]

On Tue, 5 Aug 2003 11:33:14 -0400, "john smith" <as**@asdf123as df.net>
wrote:

Hi, I would like to save a stream's output precision and then change the
precision and then restore it. One example I found was using
ios_base::fixe d, and ios_base::float field. But on my machine this only
gives 6 or 8 digits after the decimal. I would like at least 12. If I do
cout.precision (12), then cout is forever set to 12 precisions from that
point on. I guess I can call cout.precision( 4) when I'm done, but how do I
know that 4 is the default?

example:
ios_base::fmtf lags f = cout.flags();
cout.setf(ios_ base::fixed, ios_base::float field);
cout << 12.512312312312 312312312312312 3 << endl;
cout.flags(f );
cout << 12.512312312312 312312312312312 3 << endl;

http://www.boost.org/libs/io/doc/ios_state.html

Tom