爪哇郎。Java 中的 Long.lowestOneBit()方法，示例
原文:https://www . geesforgeks . org/Java-lang-long-lowerstonebit-method-Java-examples/
java . lang . long . lowestonebit()是 Java 中的一个内置方法，它首先将数字转换为二进制，然后查找出现在最低位置的第一个设置位，然后重置剩余的位，然后返回值。在简单语言中，如果一个数字的二进制表达式包含最少的一个设置位，它将从右-1 返回 2^(first 设置位位置。如果二进制表达式不包含任何设置位，则返回 0。
语法:
public static long lowestOneBit(long num)
Parameters:
num - the number passed
Returns:
long value by only considering lowest 1 bit in the argument.
示例:
Input : 36
Output : 4
Explanation: Binary Representation = 0010 0100
It considers lowest bit(at 3) and now reset rest of the bits i.e. 0000 0100
so result = 0100 i.e. 4 or in simple terms, the first set
bit position from right is at position 3, hence 2^2=4
Input : 1032
Output : 8
下面的程序说明了 java.lang.Long.lowestOneBit()函数:
程序 1:
// Java program that demonstrates the use of
// Long.lowestOneBit() function
// include lang package
import java.lang.*;
public class GFG {
public static void main(String[] args)
{
long l = 1032;
// returns a long value with at most a single one-bit, in the position
// of the lowest-order ("rightmost") one-bit in the specified int value.
System.out.println("Lowest one bit = " + Long.lowestOneBit(l));
l = 45;
System.out.println("Lowest one bit = " + Long.lowestOneBit(l));
}
}
输出:
Lowest one bit = 8
Lowest one bit = 1
程序 2: 下面的程序演示了传递负数时函数的使用。
// java program that demonstrates the use of
// Long.lowestOneBit() function
// negative number
// include lang package
import java.lang.*;
public class GFG {
public static void main(String[] args)
{
long l = -12;
// prints the binary of a negative expression
System.out.println("Binary = " + Long.toBinaryString(l));
// returns a long value with at most a single one-bit, in the position
// of the lowest-order ("rightmost") one-bit in the specified int value.
System.out.println("Lowest one bit = " + Long.lowestOneBit(l));
}
}
输出:
Binary = 1111111111111111111111111111111111111111111111111111111111110100
Lowest one bit = 4
当十进制字符串值作为参数传递时，它会返回一条错误消息。
程序 3: 当一个十进制值在参数中传递时。
// java program that demonstrates the
// Long.lowestOneBit() function
// decimal value in argument
// include lang package
import java.lang.*;
public class GFG {
public static void main(String[] args)
{
System.out.println("Lowest one bit = " + Long.lowestOneBit(12.34));
}
}
输出:
prog.java:12: error: incompatible types: possible lossy conversion from double to long
System.out.println("Lowest one bit = " + Long.lowestOneBit(12.34));
程序 4: 当一个字符串值在参数中传递时。
// java program that demonstrates the
// Long.lowestOneBit() function
// string value in argument
// include lang package
import java.lang.*;
public class GFG {
public static void main(String[] args)
{
System.out.println("Lowest one bit = " + Long.lowestOneBit("12"));
}
}
输出:
prog.java:12: error: incompatible types: String cannot be converted to long
System.out.println("Lowest one bit = " + Long.lowestOneBit("12"));
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