Java 中的大整数浮点值()方法

原文:https://www . geesforgeks . org/big integer-float value-method-in-Java/

Java . math . BigInteger . float VaLue()将这个 BigInteger 转换成一个浮点值。如果这个函数返回的值对于一个数值来说太大而不能表示为浮点数，那么它将被转换为浮点数。负无穷大或浮动。视情况而定，正值 _ 无穷大。这种转换可能会丢失关于 BigInteger 值精度的信息。

语法:

public float floatValue()

返回:该方法返回一个浮点值，代表这个大整数的浮点值。

示例:

Input: BigInteger1=32145
Output: 32145.0
Explanation: BigInteger1.floatValue()=32145.0.

Input: BigInteger1=32145535361361525377
Output: 3.2145535E19
Explanation: BigInteger1.floatValue()=3.2145535E19\. This BigInteger is too big 
for a magnitude to represent as a float then it will be converted to 
Float.NEGATIVE_INFINITY or Float.POSITIVE_INFINITY as appropriate.

下面的程序说明了 BigInteger 类的 floatValue()方法:

例 1:

// Java program to demonstrate floatValue() method of BigInteger

import java.math.BigInteger;

public class GFG {

    public static void main(String[] args)
    {

        // Creating 2 BigInteger objects
        BigInteger b1, b2;

        b1 = new BigInteger("32145");
        b2 = new BigInteger("7613721");

        // apply floatValue() method
        float floatValueOfb1 = b1.floatValue();
        float floatValueOfb2 = b2.floatValue();

        // print floatValue
        System.out.println("floatValue of "
                           + b1 + " : " + floatValueOfb1);
        System.out.println("floatValue of "
                           + b2 + " : " + floatValueOfb2);
    }
}

输出:

floatValue of 32145 : 32145.0
floatValue of 7613721 : 7613721.0

例 2:当返回浮动太大，无法用一个量级表示为一个浮动时。

// Java program to demonstrate floatValue() method of BigInteger

import java.math.BigInteger;

public class GFG {

    public static void main(String[] args)
    {
        // Creating 2 BigInteger objects
        BigInteger b1, b2;

        b1 = new BigInteger("32145535361361525377");
        b2 = new BigInteger("7613721535372632367351");

        // apply floatValue() method
        float floatValueOfb1 = b1.floatValue();
        float floatValueOfb2 = b2.floatValue();

        // print floatValue
        System.out.println("floatValue of "
                           + b1 + " : " + floatValueOfb1);
        System.out.println("floatValue of "
                           + b2 + " : " + floatValueOfb2);
    }
}

输出:

floatValue of 32145535361361525377 : 3.2145535E19
floatValue of 7613721535372632367351 : 7.6137214E21

参考:https://docs . Oracle . com/javase/7/docs/API/Java/math/biginteger . html # float value()

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