Notes

Java - swap two numbers without using temp var

author: Paul Kim

categories: java

tags: java

swap two numbers without using temp var

Note: this code can break due to possibility of overflow, sign handling, not-a-number, and divide-by-zero.

Honestly, I can't think of why anyone would use this in the real world.

public class Main {
    public static void main(String[] args) {


        // method 1: using + and - operator
        int a1 = 123;
        int b1 = 456;

        a1 = a1 + b1;
        b1 = a1 - b1;
        a1 = a1 - b1;

        System.out.println(a1);
        System.out.println(b1);


        // method 2: using * and / operator
        int a2 = 111;
        int b2 = 333;

        a2 = a2 + b2;
        b2 = a2 - b2;
        a2 = a2 - b2;

        System.out.println(a2);
        System.out.println(b2);


        // method 3: using ^ operator
        int a3 = 222;
        int b3 = 444;

        a3 = a3 + b3;
        b3 = a3 - b3;
        a3 = a3 - b3;

        System.out.println(a3);
        System.out.println(b3);
    }
}