Java BigIntegerMath isPowerOfTwo() 函数

Guava的BigIntegerMath类的方法 isPowerOfTwo(BigInteger x )如果x代表2的幂，则返回true。

语法：

public static boolean isPowerOfTwo(BigInteger x)

参数： 该方法接收要检查的大整数 x 作为参数。

返回值： 如果x是2的幂，该方法返回真。

下面的例子说明了BigIntegerMath.isPowerOfTwo()方法：

例1：

// Java code to show implementation of
// isPowerOfTwo(BigInteger x) method of
// Guava's BigIntegerMath class
 
import java.math.*;
import com.google.common.math.BigIntegerMath;
 
class GFG {
 
    // Driver code
    public static void main(String args[])
    {
        BigInteger a1 = BigInteger.valueOf(63);
 
        // Using isPowerOfTwo(BigInteger x) method
        // of Guava's BigIntegerMath class
        if (BigIntegerMath.isPowerOfTwo(a1))
            System.out.println(a1 + " is power of 2");
        else
            System.out.println(a1 + " is not power of 2");
 
        BigInteger a2 = BigInteger.valueOf(1024);
 
        // Using isPowerOfTwo(BigInteger x) method
        // of Guava's BigIntegerMath class
        if (BigIntegerMath.isPowerOfTwo(a2))
            System.out.println(a2 + " is power of 2");
        else
            System.out.println(a2 + " is not power of 2");
    }
}

输出

63 is not power of 2
1024 is power of 2

例2：

// Java code to show implementation of
// isPowerOfTwo(BigInteger x) method of
// Guava's BigIntegerMath class
 
import java.math.*;
import com.google.common.math.BigIntegerMath;
 
class GFG {
 
    // Driver code
    public static void main(String args[])
    {
        BigInteger a1 = BigInteger.valueOf(1);
 
        // Using isPowerOfTwo(BigInteger x) method
        // of Guava's BigIntegerMath class
        if (BigIntegerMath.isPowerOfTwo(a1))
            System.out.println(a1 + " is power of 2");
        else
            System.out.println(a1 + " is not power of 2");
 
        BigInteger a2 = BigInteger.valueOf(567);
 
        // Using isPowerOfTwo(BigInteger x) method
        // of Guava's BigIntegerMath class
        if (BigIntegerMath.isPowerOfTwo(a2))
            System.out.println(a2 + " is power of 2");
        else
            System.out.println(a2 + " is not power of 2");
    }
}

输出