import java.math.BigDecimal;
import java.math.RoundingMode;

/**
 * {@link <a href=
 * "https://[Log in to view URL]"
 * target="_blank">Arrotondamento condizionato sul decimale</a>}
 * 
 * @author itammb ( Italia Massimiliano Buscati )
 * @version JDK 1.15
 *
 */
class Main {

    /**
	 * @see BigDecimal
	 * @see BigDecimal#setScale(int newScale, RoundingMode roundingMode)
	 * @see RoundingMode
	 *
	 */
	public static void roundingOnDecimal() {
		double calculated = 0.7d + 0.1d;
		double calculatedOther = 0.9d - 0.1;

		// arrotondamento con errore
		System.out.println("0.7d + 0.1d -> " + calculated);
		System.out.println("0.9d - 0.1 -> " + calculatedOther);
		System.out.println(calculated + " != " + calculatedOther);

		// arrotondamento condizionato sul decimale
		BigDecimal bd = new BigDecimal(calculated);
		// rounding policy: [cifra decimale, tipo arrotondamento]
		bd = bd.setScale(1, RoundingMode.CEILING);
		calculated = bd.doubleValue();

		System.out.println(calculated + " == " + calculatedOther);
    }
    
    public static void main(String[] args) {
		// Unit test - arrotondamento condizionato sul decimale
		roundingOnDecimal();
    }
}