1.using temporary variable method is the best as it is applicable to all
datatype.
2.using airthmatic expresion:- problem arise if we r swap the value using
pointer and both pointer point to same location
let int *x and int *y both point to a=20;
now we write a method swap
void swap(int *x,int *y)
{
*x=*x+*y; //20+20=40
*y=*x-*y; //40-40=0;
*x=*x-*y;// 0-0=0
}
In this case this method fail since x and y both point to a=20;and result
become 0;
3.same problem arise in bitwise xor opertor.
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