Java code to find factorial using method

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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