@Tendura: This violates the sequence point rule. Results are
undefined.
Dave
On Jul 12, 2:02 pm, tendua <6fae1ce6347...@gmail.com> wrote:
> regarding question to the generic macro to swap int, float, double
>
> # define swap(a,b) ((a)^=(b)^=(a)^=(b))
>
> On Jul 12, 10:08 pm, Aniket Dutta <aniketdutt...@gmail.com> wrote:
>
>
>
> > c=a+b
> > then find b=c-a;
> > if this b equals previous one then ok else overflow
>
> > On 7/9/11, John Hayes <agressiveha...@gmail.com> wrote:
>
> > > regarding question related to overflow
>
> > > int ovr_sum(int *sum,int a,int b)
> > > {
> > > *sum=a+b
> > > if(*sum<0)
> > > return -1; //overflow
> > > else
> > > return 0; //no problem with the sum (overflow don't occur)
> > > }
> > > On Sat, Jul 9, 2011 at 2:05 PM, John Hayes <agressiveha...@gmail.com>
> > > wrote:
>
> > >> generic swap can be written as -> #define Swap(T, a, b) {T temp = a; a=b;
> > >> b=temp;}
>
> > >> this is working fine in gcc
>
> > >> On Sat, Jul 9, 2011 at 1:45 PM, saurabh singh <saurab...@gmail.com>
> > >> wrote:
>
> > >>> #include<stdio.h>
> > >>> #include<error.h>
> > >>> #include<malloc.h>
> > >>> #include<stdlib.h>
> > >>> void swap(void *p1,void *p2,const unsigned size)
> > >>> {
> > >>> char *buff=(char*) malloc(size*sizeof(char));
> > >>> if(!buff)
> > >>> {
> > >>> perror("malloc");
> > >>> exit(11);
> > >>> }
> > >>> memcpy(buff,p1,size);
> > >>> memcpy(p1,p2,size);
> > >>> memcpy(p2,buff,size);
> > >>> free(buff);
> > >>> return;
> > >>> }
> > >>> int main()
> > >>> {
> > >>> int a=12,b=24;
> > >>> char c='a',d='b';
> > >>> float e=1.1f,f=2.3f;
> > >>> char wrd1[]="Hello";
> > >>> char wrd2[]="Bye";
> > >>> char *p=wrd1;
> > >>> char *q=wrd2;
> > >>> swap(&a,&b,sizeof(int));
> > >>> swap(&c,&d,sizeof(char));
> > >>> swap(&e,&f,sizeof(float));
> > >>> swap(&p,&q,sizeof(p));
> > >>> printf("%d\t%d\n",a,b);
> > >>> printf("%c\t%c\n",c,d);
> > >>> printf("%f\t%f\n",e,f);
> > >>> printf("%s\t%s\n",p,q);
> > >>> return 0;
> > >>> }
> > >>> Its a generic function not a macro, I know but the idea would be same.
>
> > >>> --
> > >>> Saurabh Singh
> > >>> B.Tech (Computer Science)
> > >>> MNNIT ALLAHABAD
>
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