Java 番石榴| long x，RoundingMode 模式的 LongMath 类的 sqrt(带示例的)
番石榴龙数学类的方法 sqrt(长 x，舍入模式)接受两个参数，根据第二个参数指定的舍入模式计算第一个参数舍入后的平方根。
语法:
public static long sqrt(long x, RoundingMode mode)
参数:这个方法取两个参数:
- x: is a long value requiring the square root.
- mode: is the rounding mode according to which rounding is performed.
返回值:该方法返回 x 的平方根，按照指定的舍入方式进行舍入。
异常:此方法抛出以下参数:
- IllegalArgumentException:if x<0 .
- Arithmetic exception: If the mode is circular mode. No, sqrt(x) is not an integer.
枚举舍入模式
| 枚举常数 | 描述 | | 【天花板】 | 舍入模式向正无穷大舍入。 | | DOWN | 舍入模式为向零舍入。 | | FLOOR | 舍入模式为向负无穷大舍入。 | | HALF _ DOWN | 舍入模式为向“最近邻居”舍入，除非两个邻居等距，在这种情况下舍入为 DOWN。 | | HALF _ EVEN | 舍入模式为向“最近邻居”舍入，除非两个邻居等距，在这种情况下，向偶数邻居舍入。 | | 【HALF _ UP】 | 取整模式为向“最近邻居”取整，除非两个邻居等距，在这种情况下取整。 | | 【不必要的】 | 舍入模式断言请求的操作有确切的结果，因此没有舍入的必要。 | | UP | 取整模式为远离零取整。 |
下面给出了一些例子，以便更好地理解实现:
例 1:
// Java code to show implementation of
// sqrt(long x, RoundingMode mode) method
// of Guava's LongMath class
import java.math.RoundingMode;
import com.google.common.math.LongMath;
class GFG {
// Driver code
public static void main(String args[])
{
long x1 = 524;
// Using sqrt(long x, RoundingMode mode)
// method of Guava's LongMath class
// The RoundingMode HALF_EVEN rounds towards
// the nearest neighbor unless both neighbors
// are equidistant, in which case, round towards
// the even neighbor.
long ans1
= LongMath.sqrt(x1,
RoundingMode.HALF_EVEN);
System.out.println("Square root of " + x1
+ " is : " + ans1);
long x2 = 316;
// Using sqrt(long x, RoundingMode mode)
// method of Guava's LongMath class
// The RoundingMode FLOOR rounds towards
// negative infinity.
long ans2
= LongMath.sqrt(x2,
RoundingMode.FLOOR);
System.out.println("Square root of " + x2
+ " is : " + ans2);
}
}
输出:
Square root of 524 is : 23
Square root of 316 is : 17
例 2:
// Java code to show implementation of
// sqrt(long x, RoundingMode mode) method
// of Guava's LongMath class
import java.math.RoundingMode;
import com.google.common.math.LongMath;
class GFG {
// Driver code
public static void main(String args[])
{
int x = -65;
try {
// Using sqrt(long x, RoundingMode mode)
// method of Guava's LongMath class
// The RoundingMode HALF_EVEN rounds towards
// the nearest neighbor unless both neighbors
// are equidistant, in which case, round towards
// the even neighbor.
// This should throw "IllegalArgumentException"
// as x < 0
long ans1 = LongMath.sqrt(x,
RoundingMode.HALF_EVEN);
}
catch (Exception e) {
System.out.println(e);
}
}
}
输出:
java.lang.IllegalArgumentException: x (-65) must be >= 0
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