Java 中的 StrictMath signum()方法
原文:https://www . geesforgeks . org/strict math-signum-method-in-Java/
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The signum(double num) is an inbuilt method of StrictMath class in Java which is used to get the signum method of the argument which means:
- 如果参数为零，则结果为零。
- 当参数大于零时，结果为 1.0。
- 如果参数小于零，则结果为-1.0。
语法:
java public static double signum(*double num*)参数:该方法接受一个双类型的单参数数，代表要返回其符号的参数。 返回值:该方法返回参数 num 的 signum 函数。它还会产生两种不同的结果:
- 当第一个参数是 NaN 时，结果是 NaN。
- 结果与 num 为正零或负零时的参数 num 相同。
示例:
```java Input: num = 72.88d Output: 1.0
Input: num = -72.88d Output: -1.0
Input: num = 0.0d Output: 0.0
```
下面的程序说明了 Java . lang . strict math . signum(double)方法的工作原理。
```java // Java praogram to illustrate the // java.lang.StrictMath.signum(double) import java.lang.*;
public class Geeks {
public static void main(String[] args) {
double num1 = 46.82d, num2 = 0.0d, num3 = -0.0d, num4 = -18.2d;
// It returns 1.0 since the argument is greater than zero double sig_val = StrictMath.signum(num1); System.out.println("Signum Value = " + sig_val);
sig_val = StrictMath.signum(num2); System.out.println("Signum Value = " + sig_val);
sig_val = StrictMath.signum(num3); System.out.println("Signum Value = " + sig_val);
sig_val = StrictMath.signum(num4); System.out.println("Signum Value = " + sig_val); } } ```
Output:
```java Signum Value = 1.0 Signum Value = 0.0 Signum Value = -0.0 Signum Value = -1.0
```
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The signum(float num) is an inbuilt method of StrictMath class in Java which is used to get the signum method of the argument which means:
- 如果参数为零，则结果为零。
- 当参数大于零时，结果为 1.0。
- 如果参数小于零，则结果为-1.0。
语法:
java public static float signum(*float num*)参数:该方法接受一个浮点类型的单个参数数，表示要返回其符号的参数。
返回值:该方法返回参数数的 signum 函数。它还会产生两种不同的结果:
- 当第一个参数是 NaN 时，结果是 NaN。
- 结果与 num 为正零或负零时的参数 num 相同。
示例:
```java Input: num = 11.8f Output: 1.0
Input: num = -55.88f Output: -1.0
Input: num = 0.0f Output: 0.0
```
下面的程序说明了 Java . lang . strict math . signum(float)方法的工作原理:
```java // Java praogram to illustrate the // java.lang.StrictMath.signum(float) import java.lang.*;
public class Geeks {
public static void main(String[] args) {
float num1 = 7.22f, num2 = 0.0f, num3 = -0.0f, num4 = -18.11f;
// It returns 1.0 since the argument is greater than zero float sig_val = StrictMath.signum(num1); System.out.println("Signum Value = " + sig_val);
sig_val = StrictMath.signum(num2); System.out.println("Signum Value = " + sig_val);
sig_val = StrictMath.signum(num3); System.out.println("Signum Value = " + sig_val);
sig_val = StrictMath.signum(num4); System.out.println("Signum Value = " + sig_val); } } ```
Output:
```java Signum Value = 1.0 Signum Value = 0.0 Signum Value = -0.0 Signum Value = -1.0
```
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