Java BigInteger pow()用法及代碼示例

java.math.BigInteger.pow(int exponent)方法用於計算BigInteger的加冪，以其他形式傳遞給指數等於(this)的數字的冪^exponent。此方法對當前BigInteger執行操作，通過該操作調用此方法並將指數作為參數傳遞。
用法:

public BigInteger pow(int exponent)

參數：此方法接受參數指數，該指數是應將BigInteger提升到的指數。返回：此方法返回一個BigInteger，它等於(this)^exponent。
Exception:
參數指數必須為正數(指數> = 0)，否則為ArithmeticException被拋出。
Examples:

Input: BigInteger1=321456, exponenet=5
Output: 3432477361331488865859403776
Explanation: BigInteger1.pow(exponent)=3432477361331488865859403776. 
321456^5=3432477361331488865859403776

Input: BigInteger1=45321, exponenet=3
Output: 93089018611161
Explanation: BigInteger1.pow(exponent)=93089018611161. 
321456^5=93089018611161

下麵的程序說明BigInteger類的pow()方法
範例1：

// Java program to demonstrate  
// pow() method of BigInteger 
  
import java.math.BigInteger; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Creating BigInteger object 
        BigInteger b1; 
  
        b1 = new BigInteger("321456"); 
        int exponent = 5; 
  
        // apply pow() method 
        BigInteger result = b1.pow(exponent); 
  
        // print result 
        System.out.println("Result of pow operation between BigInteger " 
             + b1 + " and exponent " + exponent + " equal to " + result); 
    } 
}

輸出：

Result of pow operation between BigInteger 321456 and exponent 5 equal
to 3432477361331488865859403776

範例2：

// Java program to demonstrate 
// pow() method of BigInteger 
  
import java.math.BigInteger; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Creating BigInteger object 
        BigInteger b1; 
  
        b1 = new BigInteger("12346"); 
        int exponent = 6; 
  
        // apply pow() method 
        BigInteger result = b1.pow(exponent); 
  
        // print result 
        System.out.println("Result of pow operation between BigInteger "
             + b1 + " and exponent " + exponent + " equal to " + result); 
    } 
}

輸出：

Result of pow operation between BigInteger 41432345678 and exponent 6 equal to 5058679076487529899393537031261743031889730764186441745527485504

範例3：
程序在作為參數傳遞的指數小於零時顯示異常。

// Java program to demonstrate  
// pow() method of BigInteger 
  
import java.math.BigInteger; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Creating BigInteger object 
        BigInteger b1; 
  
        b1 = new BigInteger("76543"); 
        int exponent = -17; 
          
        try { 
    
        // apply pow() method 
        BigInteger result = b1.pow(exponent); 
  
        // print result 
        System.out.println("Result of pow operation between " + b1 
                           + " and " + exponent + " equal to " + result); 
          }  
        catch (Exception e) {  
            System.out.println(e);  
        } 
  
    } 
}

輸出：

java.lang.ArithmeticException: Negative exponent

參考：https://docs.oracle.com/en/java/javase/12/docs/api/java.base/java/math/BigInteger.html#pow(int)

相關用法

注：本文由純淨天空篩選整理自AmanSingh2210大神的英文原創作品 BigInteger pow() Method in Java。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。