bigentermath 类|番石榴|爪哇
原文:https://www . geesforgeks . org/bigintermath-class-guava-Java/
BigIntegerMath用于对 bigintermath 值进行数学运算。基本的独立数学函数根据所涉及的主要数值类型分为类【IntMath】【long math】【double math】和类 。这些类具有并行结构，但每个都只支持相关的函数子集。int 和 long 的类似功能可以分别在 IntMath 和 LongMath 中找到。
申报:申报为T3】类的是:
@GwtCompatible(emulated = true)
public final class BigIntegerMath
extends Object
下表显示了番石榴大根菌纲提供的方法:
异常:
- log2:IllegalArgumentExceptionif x<= 0
- log10:IllegalArgumentExceptionif x<= 0
- sqrt : 非法参数异常 if x < 0
- 除: 算术异常如果 q == 0，或者如果 mode ==不必要且 a 不是 b 的整数倍
- 阶乘:T2【IllegalargumentExceptionif n<0
- 二项式:IllegalArgumentExceptionif n<0，k n
例 1 :
// Java code to show implementation of
// BigIntegerMath Class of Guava
import java.math.*;
import com.google.common.math.BigIntegerMath;
class GFG {
// Driver code
public static void main(String args[])
{
// Creating an object of GFG class
GFG obj = new GFG();
// Function calling
obj.examples();
}
private void examples()
{
try {
// exception will be thrown as 10 is
// not completely divisible by 3
// thus rounding is required, and
// RoundingMode is set as UNNESSARY
System.out.println(BigIntegerMath.divide(BigInteger.TEN,
new BigInteger("3"),
RoundingMode.UNNECESSARY));
}
catch (ArithmeticException ex) {
System.out.println("Error Message is : " +
ex.getMessage());
}
}
}
Output:
Error Message is : Rounding necessary
例 2 :
// Java code to show implementation of
// BigIntegerMath Class of Guava
import java.math.*;
import com.google.common.math.BigIntegerMath;
class GFG {
// Driver code
public static void main(String args[])
{
// Creating an object of GFG class
GFG obj = new GFG();
// Function calling
obj.examples();
}
private void examples()
{
// As 10 is divisible by 5, so
// no exception is thrown
System.out.println(BigIntegerMath.divide(BigInteger.TEN,
new BigInteger("5"),
RoundingMode.UNNECESSARY));
// To compute log to base 10
System.out.println("Log10 is : " +
BigIntegerMath.log10(new BigInteger("1000"),
RoundingMode.HALF_EVEN));
// To compute factorial
System.out.println("factorial is : " +
BigIntegerMath.factorial(7));
// To compute log to base 2
System.out.println("Log2 is : " +
BigIntegerMath.log2(new BigInteger("8"),
RoundingMode.HALF_EVEN));
// To compute square root
System.out.println("sqrt is : " +
BigIntegerMath.sqrt(BigInteger.
TEN.multiply(BigInteger.TEN),
RoundingMode.HALF_EVEN));
}
}
Output:
2
Log10 is : 3
factorial is : 5040
Log2 is : 3
sqrt is : 10
参考:T2】谷歌番石榴
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