# To swap two numbers
public class SwapNumbers {
  public static void main(String[] args) {
    float first = 7.5f, second = 3.9f;
    System.out.println("Before swapping:");
    System.out.println("First number = " + first);
    System.out.println("Second number = " + second);
    float temporary = first;
    first = second;
    second = temporary;
    System.out.println("After swapping:");
    System.out.println("First number = " + first);
    System.out.println("Second number = " + second);
  }
}