class swap
{
public:
int a,b;
void swapp()
{
a = a + b;
b = a - b;
a = a - b;
}
};
class swap s1.
s1.swapp();
cout<<a<<b;

void main()
{
int a,b;//example a=10,b=12;
a=a+b;//a=22
b=a-b;//b=10;
a=a-b;//a=12
}

void main()
{
int a,b;//example a=10,b=12;
a=a~b;//a=22
b=a~b;//b=10; 
a=a~b;//a=12
}


NOTE:
    ~=XOR operator( not able to write xor
            operator so iam using this symbol which is not 
             correct)

swap(a,b);
{
  a=a+b;
  b=a-b;
  a=a-b;
}
Explenation:
if a=5 and b=10
   a=a+b(5+10)=15
   b=a-b(15-10)=5------------swaped here
   a=a-b(15-5)=10------------