Swap function

With tmp varible:

inline void swap(int *a,int *b ){
int tmp=0;
tmp=*a;
*a=*b;
*b=tmp;

return;
}


Without tmp varible:

inline void swap(int *a,int *b ){

*a=*a+*b;
*b=*a-*b;
*a=*a-*b;
return;
}

reference:

http://www.velocityreviews.com/forums/t283891-swap-two-integers-without-using-a-tmp-variable.html