Shulou(Shulou.com)06/01 Report--

This article mainly introduces what will be output of System.out.println (1.0 System.out.println 0) in java, which has certain reference value. Interested friends can refer to it. I hope you can learn a lot after reading this article. Let's take a look at it.

Let's first try package erdan.demo;public class TestDouble {public static void main (String [] args) {System.out.println (1.0 / 0);}}

What you think, what I think, it should throw an ArithmeticException exception.

But it now outputs Infinity.

Why?

The Double data type supports infinity. Are there any other types that support it?

Yes, and Float. Let's take a look at the Double source code. We can see / * a constant that maintains the positive infinity of the type * / public static final double POSITIVE_INFINITY = 1.0 / 0.0X infinity * * a constant, and the negative infinity of the type * / public static final double NEGATIVE_INFINITY =-1.0 / 0.0 / * A constant, non-numeric type * / public static final double NaN = 0.0d / 0.0

Let's experiment with 0.0Univer and-1.0ppm.

Double positive infinity = 1.0 / 0 * * double negative infinity =-1.0 / 0

System.out.println ("positive infinity:" + positive infinity); System.out.println ("negative infinity:" + negative infinity); Double non-numeric value = 0.0amp 0; System.out.println ("non-numeric 0.0infinity 0->" + non-numeric value); output:

Positive infinity: Infinity negative infinity:-Infinity non-numeric 0.0Universe 0-> NaN

Operate on infinity next to test infinity of Float type and Doubloe type public static void testFloatInfinity () {Float infFloat = Float.POSITIVE_INFINITY; Double infDouble = Double.POSITIVE_INFINITY; System.out.println ("infFloat + 5 =" + (infFloat + 5)); System.out.println ("infFloat-infDouble =" + (infFloat-infDouble) System.out.println ("infFloat *-1 =" + (infFloat *-1));} output:

InfFloat + 5 = InfinityinfFloat-infDouble = NaNinfFloat *-1 =-Infinity can notice that the three-line operation is consistent with our expected results.

Ps: the result of Infinity- Infinity is not a numeric type

Judge these values

Public static void checkFloatInfinity () {Double positive infinity = 1.0 / 0; Double negative infinity =-1.0 / 0; Double non-numeric value = 0.0 / 0; System.out.println ("judge positive infinity:" + Double.isInfinite (positive infinity); System.out.println ("judge negative infinity:" + (Double.NEGATIVE_INFINITY = = negative infinity)) System.out.println ("determine non-numeric value (= =):" + (Double.NaN = = non-numeric value); System.out.println ("determine non-numerical value (isNaN):" + Double.isNaN (non-numeric value)) } output: judge positive infinity: true judge negative infinity: true judge non-numerical value (= =): false judge non-numerical value (isNaN): true thank you for reading this article carefully. I hope the article "what will be output of System.out.println (1.0cm 0) in java" shared by the editor will be helpful to you. At the same time, I hope you will support it. Pay attention to the industry information channel, more related knowledge is waiting for you to learn!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.