Renesas TM V.3.20A Spezifikationen PDF herunterladen (Seite 64)

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Renesas Technology, Tools FAQs

Last Updated: December 20, 2000

Document Number: 01051240_e

When executing the following program, long-type variable "l" is supposed to hold "-1". However, the results become 0xF(15). How

can I make the results be "-1"?

void main( void )

{

struct

{

short r : 10 ;

short i : 4 ;

short s : 2 ;

} buf ;

long l ;

buf.i = -1 ;

l = (long)buf.i ;

}

NC30WA processes the bit field member type as 'unsigned'. Therefore, when a long type variable is stored (transferred), the value is

'zero-expanded'. To have this treated as 'signed', make sure you explicitly declare it as 'signed' in the bit field member type

declaration.

[Example]

struct

{

signed short r : 10 ;

signed short i : 4 ;

signed short s : 2 ;

} buf ;

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