Four ways to exchange two variables

For the exchange of two variables, I found four methods, below I use Java to illustrate.

1. Use the third variable to exchange values, a simple method.

Class Testev

Create a class

{

public static void Main (String[]args)

{

int x =5,y=10; Define two variables

int temp = x; Define the third Temp variable temp and extract the X value

x = y; Assign the value of Y to X

y = temp; Then assign the temporary variable temp value to Y

System.out.println ("x=" +x+ "y=" +y);

}

}

2. It is possible to exchange data in the same way that two numbers are summed and subtracted, and the disadvantage is that if the values of x and Y are too large, the value exceeding int will lose precision.

Class testev//Create a classes {public static void main (String[]args) {int x =5,y=10;//define two variables x = x + y        ;        X (All) = 5 + ten; y = x-y;                Y (5) = x (15)-10;        x = XY;            X (Ten) = X (All)-Y (5) System.out.println ("x=" +x+ "y=" +y); }    }

3. The use of bit operations to exchange data, The thought principle used is: a number of different or the same number two times, the result is the number , and will not exceed the int range

Class Testev

Create a class

{

public static void Main (String[]args)

{

int x =5,y=10; Define two variables

x = X^y;

y = x^y; Y= (x^y) ^y

x = X^y; x= (x^y) ^x

System.out.println ("x=" +x+ "y=" +y);

}

}

　　

4. Simplest, swap variables directly at the time of printout

Class Testev

Create a class

{

public static void Main (String[]args)

{

int x =5,y=10; Define two variables

System.out.println ("x=" +y+ "y=" +x); Exchange directly at the time of output

}

}

From for notes (Wiz)

Four ways to exchange two variables