gcc strangeness

[Cyrille Lefevre]

"Roman Kurakin" <rik at cronyx.ru> wrote:
> Dmitry Morozovsky wrote:
[snip]
> >marck at woozle:/tmp/tsostik> cat x.c
> >#include <stdio.h>
> >int main ()
> >{
> >        float a;
> >        for(a=0.01;a<=0.1; a+=0.01)
> >          printf("%f %.3f %d\n", a*100, a*100, (int)(a*100));
> >  
> >
> I believe this should more correct:
> printf ("%f %.3f %d\n", a*100, a*100, (int)(a*100+.5));


it is much better to use ceilf(3) (or ceil(3) for double) here :

printf("%f %.3f %f %d\n", a*100, a*100,
                        ceilf(a*100), (int)ceilf(a*100));

# ./a.out
1.000000 1.000 1.000000 1
2.000000 2.000 2.000000 2
3.000000 3.000 3.000000 3
4.000000 4.000 4.000000 4
5.000000 5.000 5.000000 5
6.000000 6.000 6.000000 6
7.000000 7.000 7.000000 7
8.000000 8.000 8.000000 8
9.000000 9.000 9.000000 9
9.999999 10.000 10.000000 10

Cyrille Lefevre.
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