java.lang.StrictMath.sqrt()是Java中StrictMath类的内置方法,用于获取指定双精度值的精确四舍五入的正平方根。
用法:
public static double sqrt(double num)
参数:该函数接受双精度类型的单个参数num,该参数的平方根将由该函数返回。
返回值:此方法返回num的正平方根。它也引起了特殊情况:
- 如果参数为NaN或小于零,则函数返回NaN
- 当参数为正无限大时,该函数返回正无限大。
- 如果参数为零,则该函数返回零且符号与参数相同
- 结果是最接近参数值的数学平方根的double值。
例子:
Input: num = 25 Output: 5.0 Input: -729 Output: NaN
以下程序说明了java.lang.StrictMath.sqrt()方法的使用:
示例1:
// Java Program to illustrate
// java.lang.StrictMath.sqrt() function
import java.lang.*;
public class Geeks {
public static void main(String[] args)
{
double num1 = 289, num2 = -729;
double num3 = 0.0, num4 = 547.87;
// It returns the positive square root
double sqrt_Value = StrictMath.sqrt(num1);
System.out.println("square root = " + sqrt_Value);
sqrt_Value = StrictMath.sqrt(num2);
System.out.println("square root = " + sqrt_Value);
sqrt_Value = StrictMath.sqrt(num3);
System.out.println("square root = " + sqrt_Value);
sqrt_Value = StrictMath.sqrt(num4);
System.out.println("square root = " + sqrt_Value);
}
}
输出:
square root = 17.0 square root = NaN square root = 0.0 square root = 23.406622994357814
示例2:
// Java Program to illustrate
// java.lang.StrictMath.sqrt() function
import java.lang.*;
public class Geeks {
public static void main(String[] args)
{
double num1 = 1160, num2 = -97;
double num3 = -0.0, num4 = 144;
double num5 = -72.18;
// It returns the positive square root
double sqrt_Value = StrictMath.sqrt(num1);
System.out.println("square root = " + sqrt_Value);
sqrt_Value = StrictMath.sqrt(num2);
System.out.println("square root = " + sqrt_Value);
sqrt_Value = StrictMath.sqrt(num3);
System.out.println("square root = " + sqrt_Value);
sqrt_Value = StrictMath.sqrt(num4);
System.out.println("square root = " + sqrt_Value);
sqrt_Value = StrictMath.sqrt(num5);
System.out.println("square root = " + sqrt_Value);
}
}
输出:
square root = 34.058772731852805 square root = NaN square root = -0.0 square root = 12.0 square root = NaN
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注:本文由纯净天空筛选整理自ankita_chowrasia大神的英文原创作品 StrictMath sqrt() Method in Java。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。