Situatie

Example 1: Swap two numbers using temporary variable

public class SwapNumbers {

    public static void main(String[] args) {

        float first = 1.20f, second = 2.45f;

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

Output:

--Before swap--
First number = 1.2
Second number = 2.45
--After swap--
First number = 2.45
Second number = 1.2

Backup

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

The variables are printed before swapping using println()

• First, the value of first is stored in variable temporary (temporary = 1.20f).
• Then, value of second is stored in first (first = 2.45f).
• And 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 temporary is to hold the value of first before swapping. You can also swap the numbers without using temporary.

Solutie

Tip solutie

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