How to calculate the sum of real numbers?

Question

Java

How to calculate the sum of all real numbers, discarding the real part?

Answer 1

Here are code examples:

public class Main {

  public static void main(String[] args) {

    final double num1 = 10.14;
    final double num2 = 11.142;
    final double num3 = 13.1844;
    final Double sum = (num1 + num2 + num3);

    long result1 = Math.round(sum);
    System.out.println(result1);

    BigDecimal result2 = BigDecimal.valueOf(sum).setScale(0, RoundingMode.HALF_UP);
    System.out.println(result2);

    BigDecimal result3 = BigDecimal.valueOf(sum).round(new MathContext(2, RoundingMode.HALF_UP));
    System.out.println(result3);

    Long result4 = sum.longValue();
    System.out.println(result4);
    
  }

}