$i = 0
for( $j = 0; $j < 10 ; $j++ )
{
   if( $i == 0 )
   {
     $class = "even" ;
   }
   else
   {
     $class = "even" ;
   }
   $i ^= 1 ;
}

##</code><code>##

$i = 1 ;
for( $j = 0; $j < 10 ; $j++ )
{
   $i *= -1 ;
   if( $i == -1 )
   {
     $class = "even" ;
   }
   else
   {
     $class = "even" ;
   }
}

##</code><code>##

if( $class =~ /even/ )
{
   $class = "odd" ;
}
else
{
   $class = "even" ;
}

##</code><code>##

$class = ( $class ~= /even/ ) ? "odd" : "even" ;