爪哇郎。Java 中的 Long.numberOfTrailingZeros()方法，示例
原文:https://www . geesforgeks . org/Java-lang-long-number of trailing zeros-method-Java-examples/
java . lang . long . numberoftrainingzeros()是 Java 中的一个内置函数，它返回最低顺序设置位右边的尾随零位数。简单来说，它返回(位置-1) ，其中位置指的是从右侧开始的第一个设置位。如果数字不包含任何设置位(换句话说，如果数字为零)，它将返回 64。
语法:
public static long numberOfTrailingZeros(long num)
Parameters:
num - the number passed
Returns:
the number of trailing zeros after the lowest-order set bit
示例:
Input : 8
Output : 3
Explanation: Binary representation of 8 is 1000
No of trailing zeros to the right of the lowest-order set
bit is 3\.
Input : 191
Output : 0
下面的程序说明了 Java . lang . long . numberoftrailingzeros()函数:
程序 1:
// Java program that demonstrates the
// Long.numberOfTrailingZeros() function
// include lang package
import java.lang.*;
public class GFG {
public static void main(String[] args)
{
long l = 8;
// returns the number of zero bits following the lowest-order
// set bit
System.out.println("Number of trailing zeros = "
+ Long.numberOfTrailingZeros(l));
// second example
l = 25;
System.out.println("Number of trailing zeros = "
+ Long.numberOfTrailingZeros(l));
}
}
输出:
Number of trailing zeros = 3
Number of trailing zeros = 0
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
// Long.numberOfTrailingZeros() function
// negative number
// include lang package
import java.lang.*;
public class GFG {
public static void main(String[] args)
{
long l = -12;
// returns the number of zero bits following the lowest-order
// set bit
System.out.println("Number of trailing zeros = "
+ Long.numberOfTrailingZeros(l));
}
}
输出:
Number of trailing zeros = 2
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.numberOfTrailingZeros() function
// decimal value as an argument
// include lang package
import java.lang.*;
public class GFG {
public static void main(String[] args)
{
// returns the number of zero bits following the lowest-order
// set bit
System.out.println("Number of trailing zeros = "
+ Long.numberOfTrailingZeros(12.34));
}
}
输出:
prog.java:16: error: incompatible types: possible lossy conversion from double to long
System.out.println("Number of trailing zeros = "+Long.numberOfTrailingZeros(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.numberOfTrailingZeros() function
// string value as an argument
// include lang package
import java.lang.*;
public class GFG {
public static void main(String[] args)
{
// returns the number of zero bits following the lowest-order
// set bit
System.out.println("Number of trailing zeros = "
+ Long.numberOfTrailingZeros("100"));
}
}
输出:
prog.java:15: error: incompatible types: String cannot be converted to long
System.out.println("Number of trailing zeros = "+Long.numberOfTrailingZeros("100"));
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