java math 類

數學課靜態長回合(雙D) (Math Class static long round(double d) )

• This method is available in java.lang package.

  此方法在java.lang包中可用。

• This method is used to return the closest long value to the given argument.

  此方法用于將最接近的long值返回給定參數。

• This is a static method, it is accessible with the class name too.

  這是一個靜態方法，也可以使用類名進行訪問。

• The return type of this method is long, it returns the long type number which will be converted from double floating to long by adding 1/2 of the given argument.

  此方法的返回類型為long ，它返回long類型號，通過添加給定參數的1/2可以將其從double浮點數轉換為long類型。

• In this method, we pass only one parameter of a double type value.

  在此方法中，我們僅傳遞一個double類型值的參數。

• If the value of the given argument after the decimal point is greater than 4 then the value is incremented by 1 before the decimal point is returned else if the value of the given argument after the decimal point is less than or equal to 4 then the same value before the decimal point is returned.

  如果小數點后給定參數的值大于4，則在返回小數點前將值加1；否則，如果小數點后給定參數的值小于或等于4，則相同返回小數點前的值。

• This method does not throw any exception.

  此方法不會引發任何異常。

Syntax:

句法：

public static long round(double d){}

Parameter(s): d – a double value whose closest to long value to be found.

參數： d –一個雙精度值，其最接近要找到的long值。

Note:

注意：

• If we pass "NaN" (Not a Number), it returns 0.

  如果傳遞“ NaN”(非數字)，則返回0。

• If we pass negative infinity, it returns the "Long.MIN_VALUE".

  如果我們傳遞負無窮大，它將返回“ Long.MIN_VALUE”。

• If we pass positive infinity, it returns the "Long.MAX_VALUE".

  如果我們傳遞正無窮大，它將返回“ Long.MAX_VALUE”。

• If we pass the value which is less than or equal to "Long.MIN_VALUE", it returns "Long.MIN_VALUE".

  如果傳遞的值小于或等于“ Long.MIN_VALUE”，則返回“ Long.MIN_VALUE”。

• If we pass the value which is greater than or equal to "Long.MAX_VALUE", it returns "Long.MAX_VALUE".

  如果傳遞的值大于或等于“ Long.MAX_VALUE”，則返回“ Long.MAX_VALUE”。

Return value:

返回值：

The return type of this method is long, it returns a long value which is the closest to long value of given parameter.

此方法的返回類型為long ，它返回一個long值，該值最接近給定參數的long值。

Java程序演示round(double d)方法的示例 (Java program to demonstrate example of round(double d) method)

// Java program to demonstrate the example of // round(double d) method of Math Class.public class RoundMethod {public static void main(String[] args) {// declaring the variablesdouble d1 = -1.0 / 0.0;double d2 = 1.0 / 0.0;double d3 = 1234.56;double d4 = 1234.42;// Here , we will get (Long.MIN_VALUE) and we are // passing parameter whose value is (-Infinity)System.out.println("Math.round(d1): " + Math.round(d1));// Here , we will get (Long.MAX_VALUE) and we are // passing parameter whose value is (Infinity)System.out.println("Math.round(d2): " + Math.round(d2));// Here , we will get (1235) and we are // passing parameter whose value is (1234.56)System.out.println("Math.round(d3): " + Math.round(d3));// Here , we will get (1234) and we are // passing parameter whose value is (1234.12)System.out.println("Math.round(d4): " + Math.round(d4));} }

Output

輸出量

E:\Programs>javac RoundMethod.javaE:\Programs>java RoundMethod Math.round(d1): -9223372036854775808 Math.round(d2): 9223372036854775807 Math.round(d3): 1235 Math.round(d4): 1234

翻譯自: https://www.includehelp.com/java/math-class-static-long-round-double-d-with-example.aspx

java math 類

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