Java中的整数signum（）方法-yiteyi-C++库

signum函数是一个奇数数学函数，用于提取实数的符号。signum函数也称为sign函数。整数。java的signum（）方法。朗还了符号函数指定整数值的。对于正值、负值和零，该方法分别返回1、-1和0。

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语法：

public static int signum(int a)

参数： 该方法采用一个参数 A. 要对其执行操作的整数类型。

返回值： 该方法返回指定整数值的signum函数。如果指定值为负，则返回-1；如果指定值为零，则返回0；如果指定值为正，则返回1。

例如：

Consider an integer a = 27Since 27 is a positive int signum will return= 1        Consider another integer a = -61Since -61 is a negative int signum will return= -1     Consider the integer value a = 0For a zero signum, it will return = 0

下面的程序演示了Java。整型。signum（）方法：

项目1：

JAVA

                         // 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                                     ));                       
                         }                       
                         }                       

输出：

1-10

项目2：

JAVA

                         // 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                                     ));                       
                         }                       
                         }                       

输出：

-110

方案3： 对于十进制值和字符串。注：当十进制值和字符串作为参数传递时，它返回错误消息。

JAVA

                         // 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"                                     ));                       
           
           
                         }                       
                         }                       

输出：

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 output2 errors

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