Factorial of a Number in Java
Factorial of a Number in Java
Here on this page, we will learn how to Find the Factorial of a Number in Java. Factorial is a sequence of a number where we multiply by all previous numbers.
factorial of n (n!) = 1 * 2 * 3 * 4....n
Note : 0! = 1 and 1! = 1
Example :
5! = 1 * 2 * 3 * 4 * 5 = 120
Methods we will discuss
- Iterative approach for factorial
- Recursive approach for factorial
Method 1
For an input num
- Initialize fact = 1
- If num < 0 : Print Error as we can’t calculate factorial of a negative number
- Else run a iterative loop in iteration of (i) between [1, num]
- do fact = fact * i
- print the value of fact
Java Code
Run
class Main
{
// Method to find factorial of the given number
static int factorial(int n)
{
int res = 1, i;
for (i = 2; i <= n; i++)
res *= i;
return res;
}
// Driver method
public static void main(String[] args)
{
int num = 6;
System.out.println("Factorial of " + num + " is " + factorial(num));
}
}
Output:
Factorial of 6 is 720
Method 2
This method uses the recursive approach, for input num
For an input num
- Call function getFactorial(num)
- Set base case when num== 0 return 1
- Other cases return num * getFactorial(num-1);
Java Code
Run
class Main
{
// method to find factorial of given number
static int factorial(int n)
{
if (n == 0)
return 1;
return n * factorial(n - 1);
}
// Driver method
public static void main(String[] args)
{
int num = 6;
System.out.println("Factorial of " + num + " is " + factorial(num));
}
}
Output:
Factorial of 6 is 720
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public class factorial {
public static void main(String[] args) {
int n = 6;
int fact = 1;
for(int i = 1 ; i <=n ; i ++)
{
fact = fact * i;
}
System.out.println(fact + " is thefactorial of" + n);
}
}
import java.util.Scanner;
public class factorial
{
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println(“Enter Number : “);
int num = sc.nextInt();
int facto = 1;
int i = num;
while(i>0) {
facto *= i;
i–;
}
System.out.println(“Factorial of “+num+” is “+facto);
}
}
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package prep;
import java.util.Scanner;
public class factorial
{
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println(“Enter Number : “);
int num = sc.nextInt();
int facto = 1;
int i = num;
while(i>0) {
facto *= i;
i–;
}
System.out.println(“Factorial of “+num+” is “+facto);
}
}
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package prep1;
import java.util.Scanner;
public class factorial
{
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println(“Enter Number : “);
int num = sc.nextInt();
int facto = 1;
int i = num;
while(i>0) {
facto *= i;
i–;
}
System.out.println(“Factorial of “+num+” is “+facto);
}
}
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import java.util.Scanner;
public class Main{
public static void main(String[] args)
{
System.out.println(” ethe the factoral of numbers “);
Scanner sc= new Scanner(System.in);
int n=sc.nextInt();
System.out.println(factorial(n));
}
static int factorial(int n) {
if (n == 0 || n == 1) {
return 1;
}
return n * factorial(n – 1);
}
}
public class Factorial {
public static void main(String[] args) {
int num=6;
int factorial=fib(num);
System.out.println(“”+num+”=”+factorial);
}
static int fib(int num){
if(num>=1)
return num*fib(num-1);
else
return 1;
}
}
import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int a=in.nextInt();
factorial(a);
}
static void factorial(int a){
int sum=1;
for (int i = 1; i <=a ; i++) {
sum=sum*i;
}
System.out.println(sum);
}
}
public class Factorial_of_a_number {
public static void main(String[] args) {
int num = 6;
int factorial = 1;
for (int i = 1; i <= num; i++) {
factorial *= i;
if (i == num) {
System.out.println(factorial);
}
}
}
}
import java.util.*;
class HelloWorld {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println(“Enter a number to find its factorial “);
int n = sc.nextInt();
int fact =1;
for(int i=1;i<=n;i++){
fact = fact*i;
}
System.out.println("factorial of given number is : "+fact);
}
}
import java.util.Scanner;
public class FactorialofaNumber {
public static void main(String[] args) {
System.out.print(“Enter the number :: “);
Scanner scan=new Scanner(System.in);
int n=scan.nextInt();
int mul=n, fac=n;
for (int i=1;i<fac;i++){
n-=1;
mul=mul*n;
}
System.out.println("Factorial of "+fac+" = "+mul);
}
}