Factorial Program in JAVA - Step by Step

 Factorial Program in JAVA - Step by Step

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In any Programming Language, to solve a given problem, must divide that problem and then solve that problem.

In this Factorial program, we divide our problem into the three parts.

1) Imagine Output Screen with common Messages

2) Make a Logic on a Paper with pen or pencil

3) Implement that Logic (Step 2) in code

Imagine Output Screen with common Messages

Make a Logic on a Paper with pen or pencil

Implement that Logic (Step 2) in code

Factorial.java
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import java.util.Scanner;

class factorial
{
public static void main(String args[])
{
int fact = 1;
System.out.print("Enter a Number:-");

//Create Object of scanner calss 
Scanner scn = new Scanner(System.in);
int userValue = scn.nextInt();

for(int i=1;i<=userValue;i++)
{
fact = fact * i;
//i==1 --> 1 = 1 * 1   fact=1
//i==2 --> 2 = 1 * 2   fact=2
//i==3 --> 6 = 2 * 3   fact=6
//i==4 --> 24 = 6 * 4  fact=24
//i==5 --> 120 = 24 * 5 fact=120
}
System.out.println("Factorial of "userValue+" is "+fact);
}
}

Output