void swap(int i, int j)
{int t = i;i = j;j = t;
}

void swap(int *i, int *j)
{int t = *i;*i = *j;*j = t;
}

#define swap(type, i, j) {type t = i; i = j; j = t;}

#define swap(type, i, j) {type t = i; i = j; j = t;}int main()
{int a = 23, b = 47;printf("Before swap. a: %d, b: %d\n", a, b);swap(int, a, b)printf("After swap.  a: %d, b: %d\n", a, b);return 0;
}

int main()
{int a = 23, b = 47;printf("Before swap. a: %d, b: %d\n", a, b);{ int t = a ; a = b ; b = t ; }printf("After swap.  a: %d, b: %d\n", a, b);return 0;
}

void swap(int& i, int& j)
{int t = i;i = j;j = t;
}

static void Swap<T>(ref T lhs, ref T rhs)
{T temp;temp = lhs;lhs = rhs;rhs = temp;
}

java.util.Collections;
public static void swap(List<?> list,int i,int j)

// MyInteger: similar to Integer, but can change value
class MyInteger {private int x;                   // single data memberpublic MyInteger(int xIn) { x = xIn; } // constructorpublic int getValue() { return x; }  // retrieve valuepublic void insertValue(int xIn) { x = xIn;} // insert
}public class Swapping {// swap: pass references to objectsstatic void swap(MyInteger rWrap, MyInteger sWrap) {// interchange values inside objectsint t = rWrap.getValue();rWrap.insertValue(sWrap.getValue());sWrap.insertValue(t);}public static void main(String[] args) {int a = 23, b = 47;System.out.println("Before. a:" + a + ", b: " + b);MyInteger aWrap = new MyInteger(a);MyInteger bWrap = new MyInteger(b);swap(aWrap, bWrap);a = aWrap.getValue();b = bWrap.getValue();System.out.println("After.  a:" + a + ", b: " + b);}
}

public void tricky(Point arg1, Point arg2)
{arg1.x = 100;arg1.y = 100;Point temp = arg1;arg1 = arg2;arg2 = temp;
}public static void main(String [] args)
{Point pnt1 = new Point(0,0);Point pnt2 = new Point(0,0);System.out.println("X: " + pnt1.x + " Y: " +pnt1.y);System.out.println("X: " + pnt2.x + " Y: " +pnt2.y);System.out.println(" ");tricky(pnt1,pnt2);System.out.println("X: " + pnt1.x + " Y:" + pnt1.y);System.out.println("X: " + pnt2.x + " Y: " +pnt2.y);
}