Java code to find factorial using method

In this tutorial, we will discuss Java code to find factorial using method

There are many ways to calculate a factorial using Java programming language.

In this tutorial, we are going to learn about how to calculate factorial of a given number using Java method.

Factorial is a product of all positive descending integer begins with a specified number (n) and calculates up to one

Example

factorial of 5 is

5!=5*4*3*2*1=120

factorial of 4 is

4!=4*3*2*1=24

The factorial of a positive number of “n” is as follows

factorial of n is

n!=n*(n-1)*....2*1

the user can provide numbers as they wish and get the factorial according to their input

Find factorial using Java method

Program 1

import java.util.Scanner;//import the scanner class 
class Find_Factorial4{ 
public static void main(String args[]){ 
Scanner scan=new Scanner(System.in);
//create a scanner object 
System.out.println("Enter a number for find factorial"); 
int num=scan.nextInt();//get input from user
factorial(num);//call the method
}
static void factorial(int num)//user defined method for calculate factorial
{
int i,f=1;
for(i=1; i<=num; i++){
f=f*i;//calculate te factorial using for loop

}
System.out.print("Factorial of the "+num+"is "+f); 
//display the factorial
}
}

When the above code is executed, it produces the following results

Enter a number for find factorial
5
Factorial of the 6 is:  120

Find factorial using Java method with return

Program 2

import java.util.Scanner;//import the scanner class
class Find_Factorial{
public static void main(String args[]){
Scanner scan=new Scanner(System.in);//create a scanner object
System.out.println("Enter a number for find factorial");
int num=scan.nextInt();//get input from user 

System.out.print("Factorial of the "+num+"is "+factorial(num));
//call the function to find factorial

/*int result=factorial(num); //assum the output for result variable
System.out.print("Factorial of the "+num+"is: "+result);*/

//another way to find factorial
}

static int factorial(int num)
{
int i,fact=1;
for(i=1; i<=num; i++){
fact=fact*i;//calculate the factorial using for loop

}
return fact;

}
}

When the above code is executed, it produces the following results

Enter a number for find factorial
6
Factorial of the 6 is:  720

Find factorial using Ternary operator in Java

import java.util.Scanner;//import the scanner class
class Find_Factorial2{
public static void main(String args[]){
Scanner scan=new Scanner(System.in);//create a scanner object
System.out.println("Enter a number for find factorial");
int num=scan.nextInt();//get input from user

System.out.print("Factorial of the "+num+"is "+factorial(num));
//call the function to find factorial


}

static int factorial(int num)//user defined method
{
return (num==1 || num==0)? 1: num*factorial(num-1);
//calculate factorial using ternary operator
}
}

Enter a number for find factorial
5
factorial of the 5 is 120

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