BigDecimal类ulp()方法 (BigDecimal Class ulp() method)

• ulp() method is available in java.math package.

  ulp()方法在java.math包中可用。

• ulp() method is used to get the size of an ulp of this BigDecimal when this BigDecimal holds non-zero value then an ulp is the positive distance between this value and the BigDecimal value next greater in magnitude and when this BigDecimal holds zero then, in that case, an ulp of zero value is equal to the value "1".

  当此BigDecimal保持非零值时，使用ulp()方法获取此BigDecimal的ulp的大小，则ulp是该值与BigDecimal值之间的正距离，其次是幅度较大，而当此BigDecimal保持零时，在那种情况下，零值的ulp等于值“ 1”。

• ulp() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  ulp()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• ulp() method does not throw an exception at the time of calculating ulp.

  ulp()方法在计算ulp时不会引发异常。

Syntax:

句法：

public BigDecimal ulp();

Parameter(s):

参数：

• It does not accept any parameter.

  它不接受任何参数。

Return value:

返回值：

The return type of this method is BigDecimal, it returns the size of an ulp of this BigDecimal.

此方法的返回类型为BigDecimal ，它返回此BigDecimal的ulp的大小。

Example:

例：

// Java program to demonstrate the example // of BigDecimal ulp() method of BigDecimalimport java.math.*;public class UlpOfBD {
       public static void main(String args[]) {
           // Initialize three variables - int and        // String        int val1 = 2245;        int val2 = 0;        String str = "2.346";        // Initialize three BigDecimal objects          BigDecimal b_dec1 = new BigDecimal(val1);        BigDecimal b_dec2 = new BigDecimal(val2);        BigDecimal b_dec3 = new BigDecimal(str);        // returns the BigDecimal that holds         // the size of an ulp of this BigDecimal        // b_dec1         BigDecimal ulp = b_dec1.ulp();        System.out.println("b_dec1.ulp(): " + ulp);        // returns the BigDecimal that holds         // the size of an ulp of this BigDecimal        // b_dec2 i.e. it returns 1 when this         // Bigdecimal holds value 0        ulp = b_dec2.ulp();        System.out.println("b_dec2.ulp(): " + ulp);        // returns the BigDecimal that holds         // the size of an ulp of this BigDecimal        // b_dec3         ulp = b_dec3.ulp();        System.out.println("b_dec3.ulp(): " + ulp);    }}

Output

输出量

b_dec1.ulp(): 1b_dec2.ulp(): 1b_dec3.ulp(): 0.001

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