What in swaps name is this?
obviously it doesn't swap, a and b are local and vanishes when the function
returns.
void swapgen(void *a, void *b, size_t size)
{
char *ca, *cb;
int i;
ca = (char *)a;
cb = (char *)b;
for(i=0;i<size;*(ca+i)^=*(cb+i),*(cb+i)^=*(ca+i),*(ca+i)^=*(cb+i),++i);
}
void swap0(void *A, void *B)
{
void *Temp;
Temp = A;
A = B;
B = Temp;
};
void swap1(void **x, void **y) {
void *t = *x;
*x = *y;
*y = t;
}
void swap2(int *a,int* b){
int* temp;
temp=a;
a=b;
b=temp;
}
void swap3(int *a,int*b){
int* temp;
temp= a;
a=b;
b=temp;
}
________________________________
From: Paul Herring <[email protected]>
To: [email protected]
Sent: Wed, February 17, 2010 3:35:38 PM
Subject: Re: [c-prog] swap two numbers
On Wed, Feb 17, 2010 at 12:21 PM, sweet_heart _625
<sweet_heart_ 6...@yahoo. com> wrote:
> The best way of swaping is
This has to be one of the worst ways of swapping.
> swap(int a,int b)
> {
> a=a+b;
> b=a-b;
> a=a-b;
> }
No it isn't.
1) It may fail with overflow errors
2) Calling this in a program WON'T ACTUALLY SWAP ANYTHING the calling
code wants it to.
Read <http://tech. groups.yahoo. com/group/ c-prog/files/ html/swapnotemp. html>
(or <http://avsharath. googlepages. com/swapnotemp. html> if you can't
get the first copy) LIKE YOU WERE TOLD TO DO AT THE TOP OF THE THREAD!
--
PJH
http://shabbleland. myminicity. com/env
http://www.chavgang s.com/register. php?referer= 9375
[Non-text portions of this message have been removed]
