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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>>
>>
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