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Java Tutorial For Beginners: Part 3.

Problem: Java Program To Find Factorial Of A Number
import java.util.Scanner;

class Factorial {
public static void main(String args[]) {
int n, c, fact = 1;

System.out.print("Enter An Integer To Calculate It's Factorial: ");
Scanner s = new Scanner(System.in);

n = s.nextInt();

if ( n < 0 )
System.out.println("Number Must Be Non-negative.");
else
{
for ( c = 1 ; c <= n ; c++ )
fact = fact*c;

System.out.println("Factorial Of "+n+" Is = "+fact);
s.close();
}}}

Problem: Java Program To Find Factorial Of A Number Using Recursion
import java.util.*;

public class FactorialRecursion {
public static void main(String args[]) {
int num, factorial = 1;

Scanner s = new Scanner(System.in);
System.out.print("Enter An Integer To Calculate It's Factorial: ");
num = s.nextInt();

if ( num < 0 )
System.out.println("Number Must Be Non-negative.");

else {
factorial = getfactorial(num);
System.out.println(num + "! = " + factorial);
s.close();
}}

public static int getfactorial(int num) { 
if (num <= 1)
return 1;
return num * getfactorial(num-1);
}}

Problem: Java Program For Calculating Factorial Of Large Numbers
import java.util.*;
import java.math.BigInteger;

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

int n=0, c;
BigInteger inc = new BigInteger("1");
BigInteger fact = new BigInteger("1");

Scanner input = new Scanner(System.in);
if ( n < 0 )
System.out.println("Number Must Be Non-negative.");

else {
System.out.print("Enter An Integer: ");
n = input.nextInt();

for (c = 1; c <= n; c++) {
fact = fact.multiply(inc);
inc = inc.add(BigInteger.ONE);
}

System.out.println(n + "! = " + fact);
input.close();
}}}
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