Java Math sin()方法及实例

java.lang.Math.sin() 返回0.0和π之间的角度的三角正弦。如果参数是NaN或无穷大，那么结果就是NaN。如果参数是0，那么结果是一个与参数相同符号的0。返回的值将在-1和1之间。

语法:

public static double sin(double a) ;

参数：要返回的正弦值。

返回类型 ：该方法返回参数的正弦值。

实现

在这里，我们将提出2个例子，其中我们将简单地展示java.lang包方法中的Math.sin()方法的工作原理，其次是第一个例子中参数为NaN或无穷大时的具体例子的边缘情况。

例子1

// Java program to demonstrate working
// of java.lang.Math.sin() method
import java.lang.Math;
 
class Gfg {
 
    // driver code
    public static void main(String args[])
    {
        double a = 30;
         
        // converting values to radians
        double b = Math.toRadians(a);
 
        System.out.println(Math.sin(b));
 
        a = 45;
         
        // converting values to radians
        b = Math.toRadians(a);
 
        System.out.println(Math.sin(b));
 
        a = 60;
         
        // converting values to radians
        b = Math.toRadians(a);
 
        System.out.println(Math.sin(b));
 
        a = 90;
         
        // converting values to radians
        b = Math.toRadians(a);
 
        System.out.println(Math.sin(b));
    }
}

输出

0.49999999999999994
0.7071067811865475
0.8660254037844386
1.0

例2

// Java program to demonstrate working of Math.cos() method
// of java.lang package considering infinity case
 
// Importing classes from java.lang package
import java.lang.Math;
 
public class GFG {
 
    // Main driver method
    public static void main(String[] args)
    {
 
        double positiveInfinity = Double.POSITIVE_INFINITY;
        double negativeInfinity = Double.NEGATIVE_INFINITY;
        double nan = Double.NaN;
        double result;
 
        // Here argument is negative infinity,
        // output will be NaN
        result = Math.sin(negativeInfinity);
        System.out.println(result);
 
        // Here argument is positive infinity,
        // output will also be NaN
        result = Math.sin(positiveInfinity);
        System.out.println(result);
 
        // Here argument is NaN, output will be NaN
        result = Math.sin(nan);
        System.out.println(result);
    }
}

输出