! clarifying earlier post
The swaps below shows wrong ways pple have tried to swap, the only correct one
is swapgen(for generic) and
swap.
/*CORRECT SWAPS*/
void swapgen(void *a, void *b, size_t size)
{
//generic way, notice the third argument
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 swap(int *x, int *y)
{
int temp;
temp= *x;
*x = *y;
*y = temp;
}
/* WRONG SWAPS BELOW **/
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;
}
swap4(int a,int b)
{
a=a+b;
b=a-b;
a=a-b;
}
swap4b(int* a,int* b)
{
//would fail, for example in swap(INT_MAX,INT_MAX);
*a=*a+*b;
*b=*a-*b;
*a=*a-*b;
}
I hope this covers all the swaps we've seen, if I miss some right ones pls do
add to them.
So we can understand where the fuss is.
The codes are also visible here
http://www.pastebin.com/d36260a6e
L.O
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