Write a program of c++ swapping two variables without using the third variable.

Answer 1

In 3 ways you can do it,
let you have x , y as your 2 variable,

first approach:-

x=x+y;
y=x-y;
x=x+y;

second approach:-

x=x*y;
y=x/y;
x=x/y;

third approach:-

x=x^y;
y=x^y;
x=x^y;

Answer 2

Try this. It works in C++ too.
https://code.sololearn.com/cx2Zl437LAcu/?ref=app

Answer 3

If we have two variables x and y, then we can do this:

x = x + y
y = x - y
x = x - y

I'm not just going to write the program, by the way. This should be enough.

Answer 4

swap(x,y) in algorithm header works with move semantics (C++11) so it changes addresses of x and y.