Math.copySign : Math Functions « Development « Java Tutorial

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

    // Returns a copySign of the first argument
    double d = Math.copySign (1234.56, -1);
    System.out.println ("Math.copySign (1234.56, -1) = " + d);
  }
}

//

Math.copySign (1234.56, -1) = -1234.56