On Mon, Jan 07, 2013 at 03:29:59PM +0000, Andrew Haley wrote: > On 01/07/2013 05:39 AM, horseriver wrote: > > On Mon, Jan 07, 2013 at 03:09:31PM +0000, Andrew Haley wrote: > >> On 01/07/2013 05:11 AM, horseriver wrote: > >>> On Mon, Jan 07, 2013 at 02:31:19PM +0000, Andrew Haley wrote: > >>>> On 01/07/2013 04:46 AM, horseriver wrote: > >>>>> hi: > >>>>> > >>>>> how to implement this assignment by MACRO? > >>>>> int a,b,c ; > >>>>> > >>>>> ((a==0)?b:c)=8; > >>>> > >>>> This is for help with GCC, not general C coding help. > >>>> > >>>> *((a==0) ? &b : &c) = 8; > >>>> > >>>> But this is really horrible code. I wouldn't do it. > >>> > >>> thans! > >>> > >>> why gcc report that error ? > >>> > >>> gcc can translate " ((a==0)?b:c)=8 " into if-else sentence . > >>> > >>> wht is the reason ？ > >> > >> Please supply the test case and the error message. > >> > > > > ok > > > > here is this code : > > > > #define INPUT_KEYCODE(dev, scancode) ((dev->keycodesize == 1) ? ((u8*)dev->keycode)[scancode] : \ > > ((dev->keycodesize == 2) ? ((u16*)dev->keycode)[scancode] : (((u32*)dev->keycode)[scancode]))) > > > > and here is the callee code : > > > > unsigned int keycode ; > > > > INPUT_KEYCODE(dev, scancode) = keycode; > > > > dev is a struct , scancode is a unsigned int > > > > and gcc report error is : > > > > error: lvalue required as left operand of assignment > > That is the wrong error. > > I need to see the whole of the code that resulted in the error that was > "gcc can translate " ((a==0)?b:c)=8 " into if-else sentence ." gcc can translate " ((a==0)?b:c)=8 " into if-else sentence is my idea ,not a reported error thanks! >
