switch case

[Alessio]

Hi,

please see this code:

Code Select Expand

//
#include <stdio.h>

//
int main(void)
{
    //
    int i;

//
for ( i = 0; i < 10; i++ )
{
switch ( i )
{
case 0:
case 1:
case 2:
case 5:
printf("%d is in case!\n", i);
break;

default:
printf("%d is NOT in case!\n", i);
break;
}
}

return 0;
}

Why I get this output ?

0 is in case!
1 is in case!
2 is in case!
3 is in case!
4 is in case!
5 is in case!
6 is NOT in case!
7 is NOT in case!
8 is NOT in case!
9 is NOT in case!

Why 3, 4 is "in case" ?

Thanks,
Alessio.

[JohnF]

In C you need a break in each case unless you want fall-through.

   case 0:
     break;

EDIT: sorry I see what you are saying - the answer is I don't know. I've checked with previous versions of PellesC and get the same result.

EDIT1:
It would appear that PellesC is is not generating the right code. I've checked with two other compilers which both give the result you expect.

John

[Alessio]

Thank you.
Should this topic moved to bug reports ?

[JohnF]

I think so yes.

John