Java 中的 Long signum()方法
原文:https://www.geeksforgeeks.org/long-signum-method-in-java/
符号函数也称为符号函数，是一种提取实数符号的奇数数学函数。 Java . lang . long . signum()方法用于获取指定长值的 signum 函数。对于正值、负值和零，该方法分别返回 1、-1 和 0。
语法:
public static int signum(*long num*)
参数:该方法接受一个长型参数数，在其上执行信号操作。
返回值:该方法返回指定长值的 signum 函数。如果指定值为:
- 负，则该方法返回-1。
- 零，则该方法返回 0。
- 正，则该方法返回 1。
示例:
Input: (Long) 2731766
Output: 1
Input: (Long) -233611
Output: -1
Input: (Long) 0
Output: 0
下面的程序说明了 Java.lang.Long.signum()方法: 程序 1:
// Java program to illustrate the
// Java.lang.Long.signum() Method
import java.lang.*;
public class Geeks {
public static void main(String[] args)
{
// It will return 1 as long value is greater than 1
System.out.println(Long.signum(36565531));
// It will return -1 as long value is less than 1
System.out.println(Long.signum(-628127));
// Returns 0 as long value is equal to 0
System.out.println(Long.signum(0));
}
}
Output:
1
-1
0
程序 2: 为十进制值和字符串。
// Java program to illustrate the
// Java.lang.Long.signum() Method
import java.lang.*;
public class Geeks {
public static void main(String[] args)
{
// It will return compile time error
System.out.println(Long.signum(36565.531));
// It will return compile time error
System.out.println(Long.signum("628127"));
}
}
Output:
prog.java:10: error: incompatible types: possible lossy conversion from double to long
System.out.println(Long.signum(36565.531));
^
prog.java:13: error: incompatible types: String cannot be converted to long
System.out.println(Long.signum("628127"));
^
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
2 errors
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