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#include <iostream>

using namespace std;

// Use "reference" instead of pointer if we can

void mySwap(int *pa, int*pb)

{

int t = *pa;

*pa = *pb;

*pa = t;

}

void mySwap(int &ra, int &rb)

{

int t = ra;

ra = rb;

rb = t;

}

int main()

{

# if 0

// reference, get position, 按位与

int a = 100;

int & ra = a; // = &a //a&b

#endif

int a = 3; int b = 5;

mySwap(a,b);

cout << "a = "<<a<<"\n"<< endl;

cout << "b = "<<b<<"\n"<< endl;

return 0;

}