Java Program to Swap Two Numbers Using Third or Temporary Variable

Tutorialsrack 19/04/2021 Java

In this java program, you will learn how to swap two numbers using a third or temporary variable in Java. In this program, The first variable uses a temporary variable for swapping, while the second variable doesn't use any temporary variables.

Java Program to Swap Two Numbers using Temporary Variable

//Java Program to Swap Two Numbers Using Temporary Variable

public class JavaPrograms {

	public static void main(String[] args) {

		float first = 1.20f, second = 2.45f;

        System.out.println("--Before swap the numbers--");
        System.out.println("First number = " + first);
        System.out.println("Second number = " + second);

        // Value of first is assigned to temporary
        float temporary = first;

        // Value of second is assigned to first
        first = second;

        // Value of temporary (which contains the initial value of first) is assigned to second
        second = temporary;

        System.out.println("--After swap the numbers--");
        System.out.println("First number = " + first);
        System.out.println("Second number = " + second);

	}
}

Understanding the Program

In the above program, two numbers 1.20f and 2.45f which are to be swapped are stored in variables: first and second respectively.

We printed the variables before swapping using println() to see the results clearly after swapping is done.

• First, the value of first is stored in the variable temporary (temporary = 1.20f).
• Then, the value of the second is stored in the first (first = 2.45f).
• And, finally, the value of temporary is stored in second (second = 1.20f).

This completes the swapping process and the variables are printed on the screen.

Remember, the only use of a temporary variable is to hold the value of the first variable before swapping. You can also swap the numbers without using a temporary variable.

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