Java 中的整数 signum()方法
原文:https://www . geesforgeks . org/integer-signum-in-method-Java/
符号函数是一种提取实数符号的奇数数学函数。符号函数也称为符号函数。java.lang 的 Integer.signum()方法返回指定整数值的 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(*int a*)
参数:该方法取一个整数类型的参数 a ，对其进行运算。
返回值:该方法返回指定整数值的 signum 函数。如果指定值为负值，则返回-1；如果指定值为零，则返回 0；如果指定值为正值，则返回 1。
示例:
Consider an integer a = 27
Since 27 is a positive int signum will return= 1
Consider another integer a = -61
Since -61 is a negative int signum will return= -1
Consider the integer value *a* = 0
For a zero signum, it will return = 0
下面的程序说明了方法:
程序 1:
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to illustrate the
// Java.lang.Integer.signum() Method
import java.lang.*;
public class Geeks {
public static void main(String[] args) {
// It will return 1 as the int value is greater than 1
System.out.println(Integer.signum(1726));
// It will return -1 as the int value is less than 1
System.out.println(Integer.signum(-13));
// It will returns 0 as int value is equal to 0
System.out.println(Integer.signum(0));
}
}
Output:
1
-1
0
程序 2:
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to illustrate the
// Java.lang.Integer.signum() Method
import java.lang.*;
public class Geeks {
public static void main(String[] args) {
// It will return 1 as the int value is greater than 1
System.out.println(Integer.signum(-1726));
// It will return -1 as the int value is less than 1
System.out.println(Integer.signum(13));
// It will returns 0 as int value is equal to 0
System.out.println(Integer.signum(0));
}
}
Output:
-1
1
0
程序 3: 为十进制值和字符串。 注意:当十进制值和字符串作为参数传递时，它会返回一条错误消息。
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to illustrate the
// Java.lang.Integer.signum() Method
import java.lang.*;
public class Geeks {
public static void main(String[] args) {
//returns compile time error as passed argument is a decimal value
System.out.println(Integer.signum(3.81));
//returns compile time error as passed argument is a string
System.out.println(Integer.signum("77"));
}
}
Output:
prog.java:10: error: incompatible types: possible lossy conversion from double to int
System.out.println(Integer.signum(3.81));
^
prog.java:14: error: incompatible types: String cannot be converted to int
System.out.println(Integer.signum("77"));
^
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
2 errors
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