Post increment in macro 2

[Sac123]

#define MAX(a,b) (a>b?a:b)

void main(void)
{
int a = 3, b=4;

printf("%d %d %d\n",a,b,MAX(a++,b++));
}

I expected the answer for this as
4 5 4
but answer i got is
4 6 5
Can anyone explain me why is this so...

 

[Cagliostro]

at the first is executed (a++ > b++ ? a : b)
after that is passed to printf;


Ion Filipski

ICQ: 95034075
AIM: IonFilipski
filipski@excite.com

 

[Sac123]

but according to ur explaination it should print
4 5 4.
can you plz elaborate why b is getting incremented twice

 

[xwb]

The order of evaluation is undefined in this instance. Actually, the macro would have been

(a++ > b++? a++: b++)

a is incremented twice that is probably why you are getting 5.

 

[Sac123]

Hi xwb,
thanks a lot

 

[PerFnurt]

This is a nice illustration on why macros should be avoided.


/Per

_{if (typos) cout << &quot;My fingers are faster than my brain. Sorry for the typos.&quot;;}