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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