Make a program in C++ which swaps the value of two variables without using a third variable.?

Question

The value of the variables initially may be user-defined or programmer defined. Just make a program that can swap the values without using a third variable.

Answer 1

Lol?

std::swap(a, b);



@Brian:

How can be so rude, and than not even answer the question? That's not acceptable.



But really though.

a = a + b

b = a - b

a = a - b

I'll confess, it took some thought.

Or you can use an XOR swap algorithm which will work for any object, even those without nifty inverse operations; the operation takes place bitwise on the same pattern as the addition solution above. The algorithm is not mine.



Edit:

To use this as intended with any type, you need to reinterpret_cast the complex object into an integral type and than apply the algorithm.



template

void Switch (Ty * x, Ty * y) {

if (x == y)

return;

*x ^= *y;

*y ^= *x;

*x ^= *y;



}

Answer 2

C++ Program to swap two values without using third variable

http://programming-examples.com/2013/04/c-program-to-swap-two-values-without-using-third-variable/

Answer 3

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Answer 4

use addition