Re: Formatting float numbers
Re: Formatting float numbers
- Subject: Re: Formatting float numbers
- From: Howard Hinnant <email@hidden>
- Date: Sat, 21 Aug 2010 14:07:05 -0400
On Aug 21, 2010, at 1:00 PM, Adriano Brandão wrote:
> Hi,
>
> I'm having some troubles in formatting float numbers. If I wish to display 25.342 using only 2 decimal places I could use %.2f and it would do the job. But if the number to be formatted is flat (like 25.000) I get 25.00 as a result.
> After a little bit of research I found out that I could use # as a flag (%.#2f). But, even in this case, I get 25. (with the dot). So, what's the right way for displaying only 25 (mantaining the 2 decimal places for numbers that use them)?
>
> PS: I followed the idea behind here (http://stackoverflow.com/questions/560517/how-to-set-the-float-value-to-two-decimal-number-in-objective-c) but it didn't work.
Perhaps something like this would be serviceable?
#include <math.h>
#include <stdio.h>
void display(double x)
{
int p = x == floor(x) ? 0 : 2;
printf("%.*f\n", p, x);
}
int main()
{
display(25);
display(25.256);
display(25.5);
display(5.5123);
}
25
25.26
25.50
5.51
-Howard
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