Computer scienceProgramming languagesJavaAdditional instrumentsEssential standard classesStandard classes for computations

BigInteger

Theory

Double factorial

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Implement a function to compute the double factorial. It is the product of natural numbers of the same parity, not exceeding a given number.

For example:
7!!=7⋅5⋅3⋅1
8!!=8⋅6⋅4⋅2

The function argument can be any non-negative integer.

Use BigInteger to solve the problem.

Sample Input 1: 

7

Sample Output 1: 

105
Write a program in Java 17
import java.math.BigInteger;

class DoubleFactorial {
public static BigInteger calcDoubleFactorial(int n) {
// type your java code here
}
}
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