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swap: swap two numbers without using a third object( or variable)

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swap: swap two numbers without using the third object( or variable)

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  1. // solution one
  2. //
  3. template <class T>
  4. void swap(T *a, T *b){
  5.     *a = *a + *b;
  6.     *b = *a - *b;
  7.     *a = *a - *b;
  8. }
  9.  
  10.  
  11. // solution two
  12. //
  13. template <class T>
  14. void swap(T &a, T &b){
  15.     a = a * b;
  16.     b = a / b;
  17.     a = a / b;
  18. }

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