gcc strangeness

[Roman Kurakin]

Dmitry Morozovsky wrote:

>Dear colleagues,
>
>one of my friends has raisen very strange issue regarding gcc rounding:
>
>marck at woozle:/tmp/tsostik> uname -r
>4.10-STABLE
>marck at woozle:/tmp/tsostik> gcc -v
>Using builtin specs.
>gcc version 2.95.4 20020320 [FreeBSD]
>
>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));

rik

>return 0;
>}
>marck at woozle:/tmp/tsostik> cc x.c
>marck at woozle:/tmp/tsostik> ./a.out
>1.000000 1.000 0
>2.000000 2.000 1
>3.000000 3.000 2
>4.000000 4.000 3
>5.000000 5.000 5
>6.000000 6.000 6
>7.000000 7.000 7
>8.000000 8.000 7
>9.000000 9.000 8
>9.999999 10.000 9
>
>Any comments?
>
>
>Sincerely,
>D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
>------------------------------------------------------------------------
>*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck at rinet.ru ***
>------------------------------------------------------------------------
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>
>  
>