bigentermath sqrt()函数|番石榴| Java
原文:https://www . geesforgeks . org/bigintermath-sqrt-function-guava-Java/
番石榴的大整数类的方法 sqrt(大整数 x，舍入模式)返回 x 的平方根，用指定的舍入模式进行舍入。
语法:
public static BigInteger sqrt(BigInteger x, RoundingMode mode)
参数:该方法取以下参数:
- × : A large integer for square root.
- Mode : The rounding mode for calculating the square root.
返回值:该方法返回 x 的平方根，用指定的舍入方式进行舍入。
异常:此方法抛出以下异常:
- 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。 |
以下示例说明了 BigIntegerMath.sqrt()方法:
例 1:
// Java code to show implementation of
// sqrt(BigInteger x, RoundingMode mode) method
// of Guava's BigIntegerMath class
import java.math.*;
import com.google.common.math.BigIntegerMath;
class GFG {
// Driver code
public static void main(String args[])
{
BigInteger x1 = BigInteger.valueOf(226);
// Using sqrt(BigInteger x, RoundingMode mode)
// method of Guava's BigIntegerMath class
// The RoundingMode HALF_EVEN rounds towards
// the nearest neighbor unless both neighbors
// are equidistant, in which case, round towards
// the even neighbor.
BigInteger ans1 = BigIntegerMath
.sqrt(x1,
RoundingMode.HALF_EVEN);
System.out.println("Square root of " + x1
+ "with HALF_EVEN rounding mode is: "
+ ans1);
BigInteger x2 = BigInteger.valueOf(154);
// Using sqrt(BigInteger x, RoundingMode mode)
// method of Guava's BigIntegerMath class
// The RoundingMode FLOOR rounds towards
// negative infinity.
BigInteger ans2 = BigIntegerMath
.sqrt(x2,
RoundingMode.FLOOR);
System.out.println("Square root of " + x2
+ "with FLOOR rounding mode is: "
+ ans2);
}
}
输出:
Square root of 226with HALF_EVEN rounding mode is: 15
Square root of 154with FLOOR rounding mode is: 12
例 2:
// Java code to show implementation of
// sqrt(BigInteger x, RoundingMode mode) method
// of Guava's BigIntegerMath class
import java.math.*;
import com.google.common.math.BigIntegerMath;
class GFG {
// Driver code
public static void main(String args[])
{
try {
BigInteger x1 = BigInteger.valueOf(-65);
// Using sqrt(BigInteger x, RoundingMode mode)
// method of Guava's BigIntegerMath class
// The RoundingMode HALF_EVEN rounds towards
// the nearest neighbor unless both neighbors
// are equidistant, in which case, round towards
// the even neighbor.
BigInteger ans1 = BigIntegerMath
.sqrt(x1,
RoundingMode.HALF_EVEN);
// This should throw "IllegalArgumentException"
// as x1 < 0
}
catch (Exception e) {
System.out.println("Exception: " + e);
}
}
}
输出:
Exception: java.lang.IllegalArgumentException: x (-65) must be >= 0
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