Java 中的 BigDecimal scaleByPowerOfTen()方法

原文:https://www . geesforgeks . org/big decimal-scalebypowerfresh-method-in-Java/

java . math . BigDecimal . scalebypowerfresh(int n)是 Java 上的一个内置方法，它返回一个数值等于(this * 10n)的 BigDecimal。结果的等级是(this . scale()–n)。

语法:

public BigDecimal scaleByPowerOfTen(int n)

参数: 该方法接受整数类型的单个参数 n ，该参数是 BigDecimal 对象乘以 10 的幂的值。

返回值:这个方法返回值为这个* 10n 的 BigDecimal 对象。

下面的程序说明了上述方法:

程序 1:

// Java program to demonstrate the
// scaleByPowerOfTen() method

import java.math.*;

public class Gfg {

    public static void main(String[] args)
    {

        // Assign two bigecimal objects
        BigDecimal b1 = new BigDecimal("754.000");
        BigDecimal b2 = new BigDecimal("75400");

        // Assign the result of method on b1, b2
        // to BigDecimal objects b3, b4
        BigDecimal b3 = b1.scaleByPowerOfTen(4);
        BigDecimal b4 = b2.scaleByPowerOfTen(-4);

        // Print b3, b4 values
        System.out.println(b1 + " raised to power is " + b3);
        System.out.println(b2 + " raised to power is " + b4);
    }
}

Output:

754.000 raised to power is 7.54000E+6
75400 raised to power is 7.5400

程序 2:

// Java program to demonstrate the
// scaleByPowerOfTen() method

import java.math.*;

public class Gfg {

    public static void main(String[] args)
    {

        // Assign two bigecimal objects
        BigDecimal b1 = new BigDecimal("200");
        BigDecimal b2 = new BigDecimal("7540000000");

        // Assign the result of method on b1, b2
        // to BigDecimal objects b3, b4
        BigDecimal b3 = b1.scaleByPowerOfTen(4);
        BigDecimal b4 = b2.scaleByPowerOfTen(-4);

        // Print b3, b4 values
        System.out.println(b1 + " raised to power is " + b3);
        System.out.println(b2 + " raised to power is " + b4);
    }
}

Output:

200 raised to power is 2.00E+6
7540000000 raised to power is 754000.0000

参考:https://docs . Oracle . com/javase/7/docs/API/Java/math/bigdecimal . html # scalebypowerchange(int)

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