Re: brain teasers

Daniel Rudy wrote:

To the OP:

#define MAXSWAP 32 /* maximum size of variable swap */
int swap(void *a, void *b, int size)
{
char temp[MAXSWAP]; /* temp buffer */

if (size > MAXSWAP) return(-1);
memcpy(temp, a, size);
memcpy(a, b, size);
memcpy(b, temp, size);
return(0);
}

Now what's wrong with that?

Or even in modern C:

void swap( void *a, void *b, size_t size )
{
char temp[size];

memcpy(temp, a, size);
memcpy(a, b, size);
memcpy(b, temp, size);
}

--
Ian Collins.
.

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