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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>
>
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