Write a program to find factorial of any number that can be expressed

The formula for finding the factorial of a number is: On next line there is a Java statement which just prints the String written in "". In this hub I will be explaining you the code step by step that how a factorial of a number is calculated and printed on the console. There are many predefined classes in Java which we will be using in our factorial calculation program. Let us go for explanation for the code below: Generally to help compiler in locating the class used in the program we use it regularly. It is the Scanner object which will convert bytes into types such as ints. Click here to download complete source code import java. Learning by coding will not only give you command over the language but also develop the skills in you to code successfully.

A closer look at the program stated below: Class Factorial contains a main method which is the entry point for every Java program. Line 11 calls static method fact by passing an integer to it. Learning Java by an example is the most effective technique to inculcate this versatile language. Now fact methods waiting on call gets executed sequentially, till last fact method gets executed and returns the calculated factorial value.

I will be going to demonstrate the program with and without using concepts of recursion. Only difference in the code is one is without recursion and other is with recursion. The Scanner Class is used to read data from a keyboard or disk. Here in below example it first ask user"Enter the number of for factorial calculations: Generally, whatever you know about language its additional when you have power to code small snippets.

Java has a good implementation of using the recursion. Factorial of a number formula: On line-1 we are importing Scanner class which is been kept in java. Line 3 to 5 - Our Java program begins with a declaration of class named Factorial this class is declared as public so that it can be accessible to all Java class.

Here new operator is used to create a physical Scanner object on the heap. The println method just prints whatever is given to it in double quotes. When returning from fact method it calls again fact method with integer value one less than previous integer value. Factorial of a number without recursion: I will explain the code few lines firstfollowed by code and then rest of the explanation.

The code will give you insight to some basic coding principles used in Java. Many of serious programmers who are just beginning to code in Java, come across a problem that is, how to write a program that calculate factorial of a number with and without recursion. Here variable name is scanner and type is Scanner.

It is a static method so it is called by the JVM without any objects creation on heap. The last section would be the code which will demonstrate the working of factorial number calculations.

This Scanner object is used to read data from the keyboard. The call sits on the stack till all the methods gets executed when value return from fact is 1. Generally upon execution of line, the program waits for user to type an int value from keyboard and press enter. Upon pressing enter value types by user gets assigned to int variable called as a.

It asks user to enter a number for which he wants to calculate the factorial. Line 10 code uses Scanner method nextInt to obtain user input as Integer, which he types on the keyboard.

Factorial of a number with recursion:Nov 25,  · c++ program to find factorial of any positive number; /*This is a c++ program to find factorial of any number given by user. we use while loop in it. Write a program to find the Factorial of a given number using Function declaration. Code for Program to find the factorial of a given number using function declaration in C Programming #include #include void main(). It is also possible to generate a Factorial for a number without recursion, for example, the following code block will calculate without the recursive method call: private static int Factorial(int i) { int result = i.

The above method can cause overflow for a slightly bigger numbers as factorial of a number is a big number (See factorial of 20 given in above examples). The idea is to consider prime factors of a factorial n. A trailing zero is always produced by prime factors 2. Factorial of a number formula: In general logic to find a factorial of a number is simple and easy. The formula for finding the factorial of a number is: Factorial of a (n) number = n.(n-1).(n-2).(n-3).If suppose we need to find factorial of number 5, it will be = The factorial is a classic example of using loops to solve a problem.

The below code implements the program using for loop, while the same can be implemented using other looping structures like while or do while. The factorial of any number can be found by multipling all numbers from 1 to the given number.

Write a program to find factorial of any number that can be expressed
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