Thanks for relay, Michael.
The problem I have is the pointer is work properly on the following version
if ( flag & 0x01)
{
buf[i].target = table[i].some_double;
buf[i].nexthop = table[i].some_int;
}but if I use flag == 1 instead of flag & 0x01 cause this problem. and as my understand is set the pointer buf[0].target to memory address of some_double? ;) thanks million 2009/8/31 Michael Schippling <sc...@santafe.edu> > That sets something at i elements from the start of buf to > some_double, however I didn't see a place where you set buf > itself to point to anything that might hold i elements (I can't > parse the code in the message w/o CR's so I'm extemporizing here): > > BUFTYPE bunchaElements[100]; > BUFTYPE *buf = bunchaElements; > > See this for a pretty good discussion: > http://en.wikibooks.org/wiki/C_Programming/Pointers_and_arrays > > MS > > > Jun Zhang wrote: > >> buf[i].target = table[i].some_double; >> >> this code is not set pointer to some value? >> thanks >> >> 2009/8/29 Michael Schippling <sc...@santafe.edu <mailto:sc...@santafe.edu >> >> >> >> You don't seem to have set buf to point to anything... >> MS >> >> Jun Zhang wrote: >> >> Hello, everyone. I am new to tinyos and nesc. and I have the >> following data strucuture typedef nx_struct rt_link { nx_addr_t >> target; nx_addr_t nexthop; } rt_link_t; typedef struct rt_entry >> { double some_double; uint8_t some_int; } rt_entry_t; uint8_t >> flag = 0x01; uint8_t i=0; rt_link_t * buf; rt_entry_t table[10]; >> if ( flag & 0x01) { buf[i].target = table[i].some_double; >> buf[i].nexthop = table[i].some_int; } and if I use if ( flag == >> 1) { buf[i].target = table[i].some_double; buf[i].nexthop = >> table[i].some_int; } I will get different value from buf[0], >> whats the difference? >> -- Kind Regards >> >> Jun >> >> >> >> ------------------------------------------------------------------------ >> >> _______________________________________________ >> Tinyos-help mailing list >> Tinyos-help@millennium.berkeley.edu >> <mailto:Tinyos-help@millennium.berkeley.edu> >> >> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >> >> >> >> >> -- >> Kind Regards >> >> Jun >> > -- Kind Regards Jun
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