Question

Write a method which is used to swap the values of two memory locations without using a third variable. 

Answer 1

without using a third variable - call by reference
void swap(int a, int b)
{System.out.println(a + " " + b);
a = a + b;
b = a - b;
a = a − b;
System.out.println(a + " " + b);
}