爪哇郎。Java 中的 Long.numberOfLeadingZeros()方法，示例
原文:https://www . geesforgeks . org/Java-lang-long-number of leading zeros-method-Java-examples/
java . lang . long . number of leading zeros()是 Java 中的一个内置函数，它返回最高阶集合位左边的前导零位数。简单来说，它返回 (64 位)，其中位置指的是从右侧开始的最高阶设置位。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 numberOfLeadingZeros(long num)
Parameters:
num - the number passed
Returns:
the number of leading zeros before the highest-order set bit
示例:
Input : 8
Output : 60
Explanation: Binary representation of 8 is 1000
No of leading zeros to the left of the highest-order set
bit is 60\.
Input : 25
Output : 59
下面的程序说明了 Java . lang . long . numberofleading zerows()函数:
程序 1:
// Java program that demonstrates the
// Long.numberOfLeadingZeros() 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 before the highest-order
// set bit
System.out.println("Number of leading zeros = "
+ Long.numberOfLeadingZeros(l));
// second example
l = 25;
System.out.println("Number of leading zeros = "
+ Long.numberOfLeadingZeros(l));
}
}
输出:
Number of leading zeros = 60
Number of leading zeros = 59
注意:如果是负数，每个数字都会有 0 个前导零。
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.numberOfLeadingZeros() 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 before the highest-order
// set bit
System.out.println("Number of leading zeros = "
+ Long.numberOfLeadingZeros(l));
l = -100;
System.out.println("Number of leading zeros = "
+ Long.numberOfLeadingZeros(l));
}
}
输出:
Number of leading zeros = 0
Number of leading zeros = 0
程序 3: 当一个十进制字符串值作为参数传递时，它会返回一条错误消息。
// Java program that demonstrates the
// Long.numberOfLeadingZeros() function
// decimal number
// include lang package
import java.lang.*;
public class GFG {
public static void main(String[] args)
{
// returns the number of zero bits before the highest-order
// set bit
System.out.println("Number of leading zeros = "
+ Long.numberOfLeadingZeros(10.45));
}
}
输出:
prog.java:16: error: incompatible types: possible lossy conversion from double to long
+ Long.numberOfLeadingZeros(10.45));
程序 4: 当一个字符串值在参数中传递时。
// Java program that demonstrates the
// Long.numberOfLeadingZeros() function
// string number
// include lang package
import java.lang.*;
public class GFG {
public static void main(String[] args)
{
// returns the number of zero bits before the highest-order
// set bit
System.out.println("Number of leading zeros = "
+ Long.numberOfLeadingZeros("10"));
}
}
输出:
prog.java:16: error: incompatible types: String cannot be converted to long
+ Long.numberOfLeadingZeros("10"));
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