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double format

Started by Austrian Coder May 28, 2003 at 7:14 PM 4 replies 300+ views

Original Post

May 28, 2003 at 7:14 PM

Hi! I have double b = 0.1; is there a function, which adds me an 0 to b? b = 0.10 I know it sounds silly. But i have an simple math programm (learning simple math stuff with computer). And I need an output with two decimal figure. I save two numbers in an stringstream and then return the string: stream << a << " " << b << " | "; Christian

Colin Jeanne

163

Colin Jeanne

May 28, 2003 at 8:29 PM

setprecision()

Qui fut tout, et qui ne fut rien
Invader''s Realm

RuneLancer

May 29, 2003 at 3:12 AM

I''m going to get chewed on for this, but I don''t care.

#include <stdio.h>

(...)

printf("%5.2f", b);

Beer Hunter

122

Beer Hunter

May 29, 2003 at 3:27 AM

quote:
Original post by RuneLancer
I''m going to get chewed on for this...

Indeed: the header should be <cstdio>, and you''ll want to call ios::sync_with_stdio(); somewhere.

Jan Wassenberg

105

Jan Wassenberg

May 29, 2003 at 7:48 AM

Beer Hunter: was that C++?

Austrian Coder

Author

Austrian Coder

May 29, 2003 at 8:16 AM

Here are two solutions which i found:
1.
stream << std::setprecision(2) << std::fixed << b;

2.
stringstream stream;
stream.precision(2);
stream.setf(ios_base::fixed,ios_base::floatfield);
stream << b;

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