its already been explained in previous thread
On Wed, Sep 7, 2011 at 11:01 PM, NAGARAJAN SIVARAMAN <[email protected]>wrote:

> #include<stdio.h>
> #include<conio.h>
> #define prn(a) printf("%d ",a)
> #define print(a,b,c) prn(a),prn(b),prn(c)
> #define max(a,b) (a<b)?b:a
> void main()
> {
>
>        int x=1,y=2;
>        clrscr();
>        print(max(x++,y),x,y);
>         printf("\n%d %d\n",x,y);
>        print(max(x++,y),x,y);
>        printf("\n%d %d\n",x,y);
>
>        getch();
> }
>
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