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setting precision for stringstream

General and Gameplay Programming Programming

Started by Floating October 10, 2003 02:35 AM

2 comments, last by Floating 20 years, 6 months ago

Floating

122

Author

October 10, 2003 02:35 AM

Hi, How can I set the number of digits after the decimal point in the following example? std::string str; std::stringstream stream; float floatVal=12.012345675f stream << floatal; Thanks

Fruny

1,658

October 10, 2003 02:50 AM

streamsize ios_base:: precision() const;
- Returns the precision.
streamsize ios_base:: precision(streamsize prec);
- Sets the precision, returns the previously used precision.

stream.precision(5);stream << floatVal;

or use the std::setprecision(int n) manipulator.

stream << std::setprecision(5) << floatVal;

Or just use boost::format - it's much easier

boost::format fmt( "%.5f" );stream << fmt % floatVal;

"Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it." — Brian W. Kernighan

Floating

122

Author

October 10, 2003 03:15 AM

Thanks Fruny!

What header is needed for "setprecision"?

I searched the stl but it seems it is not part of it?