带有示例的Java sqrt() 方法

Java.lang.Math.sqrt() 返回作为参数传递给它的 double 类型值的平方根。如果参数为 NaN 或负数，则结果为 NaN。如果参数是正无穷大，那么结果是正无穷大。如果传递的参数是正零或负零，则结果将与参数的结果相同。

语法：

public static double sqrt(double a)
Parameter :
a : the value whose square root is to be returned.
Return :
This method returns the positive square root value of 
the argument passed to it.

示例 1 ：显示Java.lang.Math.sqrt()方法的工作。

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

输出：

5.477225575051661
6.708203932499369
7.745966692414834
9.486832980505138

示例 2 ：当参数为 NaN 或 +infinity 时，显示Java.lang.Math.sqrt()方法的工作。

// Java program to demonstrate working
// of java.lang.Math.sqrt() method
import java.lang.Math; // importing java.lang package
  
public class GFG {
    public static void main(String[] args)
    {
  
        double positiveInfinity = Double.POSITIVE_INFINITY;
        double negativeVal = -5;
        double nan = Double.NaN;
        double result;
  
        // Here argument is negative,
        // output will be NaN
        result = Math.sqrt(negativeVal);
        System.out.println(result);
  
        // Here argument is positive infinity,
        // output will also positive infinity
        result = Math.sqrt(positiveInfinity);
        System.out.println(result);
  
        // Here argument is NaN, output will be NaN
        result = Math.sqrt(nan);
        System.out.println(result);
    }
}

输出：

NaN
Infinity
NaN