How to swap 2 numbers using a single semiconlon only in C or C++ without using swap function?

Answer 1

a^=b^=a^=b;

This one line swap any data type values as it is a binary swap

Answer 2

oh really ? I did not know

Answer 3

Noone said the numbers can't be in an array.

https://code.sololearn.com/cI9VW8XMV5v6/?ref=app

Answer 4

You need atleast 3, whether you use a temp variable, apply XOR on the variables or addition and subtraction, or address assignments.

If you wish to use a one liner, std::swap() is the way to do so. Nothing else is there.

Edit : Wrongly said. Sorry.

Answer 5

@Baptiste,
Also, it results in undefined behaviour (at least in pre c++17), as a and b are modified more then once in one sequence point.

I wrote about a similar case recently here:
https://www.sololearn.com/discuss/807745/?ref=app