package lab3;

import java.util.Scanner;

public class lab3part1 {
	public static void main (String[] args) {

		Scanner input = new Scanner(System.in);

		System.out.println(
				"\nFeet     Meters     |     Meters     Feet\n" +
				"----------------------------------------------");
		for (double feet = 1.0, meters = 20.0; feet <= 10.0; feet++, meters += 5)
		{
			System.out.printf("%4.1f     ", feet);

			System.out.printf("%6.3f", footToMeter(feet));

			System.out.print("     |     ");

			System.out.printf("%-11.1f", meters);

			System.out.printf("%7.3f\n", meterToFoot(meters));

		}
	}


	public static double footToMeter(double foot) {
		return 0.305 * foot;
	}


	public static double meterToFoot(double meter) {
		return 3.279 * meter;
	}


}











































package lab3;

import java.util.Scanner;

public class lab3part2 {

	public static void main(String[] args) {
		Scanner input = new Scanner(System.in); // Create a Scanner


		System.out.print("Enter the number of sides: ");
		int n = input.nextInt();
		System.out.print("Enter the side: ");
		double side = input.nextDouble();


		System.out.println("The area of the polygon is " + area(n, side));

	}


	public static double area(int n, double side) {
		return (n * Math.pow(side, 2) / (4 * Math.tan(Math.PI / n)));
	}
}
























































package lab3;

import java.util.Scanner;
import java.math.*;



public class lab3part3 {

	public static void main(String[] args) {

		Scanner input = new Scanner(System.in);
		System.out.print("Enter an integer: ");
		String n = input.nextLine();


		System.out.println("Factorial of " + n + " is "
			+ factorial(new BigInteger(n)));
	}


	public static BigInteger factorial(BigInteger n) {
		if (n.equals(BigInteger.ZERO))
			return BigInteger.ONE;
		else
			return n.multiply(factorial(n.subtract(BigInteger.ONE)));
	}
}