Java BigInteger divide()方法及示例

java.math.BigInteger .divide(BigInteger val) 用于计算两个BigIntegers的除法。BigInteger类内部使用整数数组进行处理，对BigIntegers对象的操作不如对基数的操作快。该方法对当前的BigInteger进行操作，该方法被调用，BigInteger作为参数被传递。

语法

public BigInteger divide(BigInteger val)

参数： 本方法接受一个参数val，它是除以这个BigInteger的值。

返回值： 该方法返回一个BigInteger，其中包含整数除法（this / val）（非浮点值），也就是说，它将结果四舍五入到其下限值。

异常： 参数val不能是0，否则会抛出算术异常。

下面的程序用来说明BigInteger的divide()方法。

例1:

// Java program to demonstrate
// divide() method of BigInteger
  
import java.math.BigInteger;
  
public class GFG {
    public static void main(String[] args)
    {
        // BigInteger object to store result
        BigInteger div;
  
        // Two objects of String created
        // Holds the values to calculate the division
        String input1 = "400000000000000000"
                        + "000000000000000000";
  
        String input2 = "8000000";
  
        // Convert the string input to BigInteger
        BigInteger a
            = new BigInteger(input1);
        BigInteger b
            = new BigInteger(input2);
  
        // Using divide() method
        div = a.divide(b);
  
        // Display the result in BigInteger
        System.out.println("The division of\n"
                           + a + " \nby\n" + b + " "
                           + "\nis\n" + div);
    }
}

输出。

The division of
400000000000000000000000000000000000 
by
8000000 
is
50000000000000000000000000000

例2：展示它是如何舍弃结果的

// Java program to demonstrate
// divide() method of BigInteger
  
import java.math.BigInteger;
  
public class GFG {
    public static void main(String[] args)
    {
        // BigInteger object to store result
        BigInteger div;
  
        // Two objects of String created
        // Holds the values to calculate the division
        String input1 = "456216545";
  
        String input2 = "21255132";
  
        // Convert the string input to BigInteger
        BigInteger a
            = new BigInteger(input1);
        BigInteger b
            = new BigInteger(input2);
  
        // Using divide() method
        div = a.divide(b);
  
        // Display the result in BigInteger
        System.out.println("The division of\n"
                           + a + " \nby\n" + b + " "
                           + "\nis " + div);
  
        double d = Double.parseDouble(input1)
                   / Double.parseDouble(input2);
  
        // Display result in double type
        // To match both the results
        System.out.print("Using double result is " + d);
    }
}

输出。

The division of
456216545 
by
21255132 
is 21
Using double result is 21.46383024109189

例3：演示除以0时抛出的异常。

// Java program to demonstrate
// divide() method of BigInteger
  
import java.math.BigInteger;
  
public class GFG {
    public static void main(String[] args)
    {
        // BigInteger object to store result
        BigInteger div;
  
        // Two objects of String created
        // Holds the values to calculate the division
        String input1 = "456216545"
                        + "452133155";
  
        String input2 = "0";
  
        // Convert the string input to BigInteger
        BigInteger a
            = new BigInteger(input1);
        BigInteger b
            = new BigInteger(input2);
  
        // Using divide() method
        try {
            div = a.divide(b);
  
            // Display the result in BigInteger
            System.out.println("The division of\n"
                               + a + " \nby\n" + b + " "
                               + "\nis\n" + div + "\n");
        }
        catch (ArithmeticException e) {
            System.out.println(e);
        }
    }
}

输出。

java.lang.ArithmeticException: BigInteger divide by zero

参考: https://docs.oracle.com/en/java/javase/12/docs/api/java.base/java/math/BigInteger.html#divide(java.math.BigInteger).