Q. Java Program to Find Factorial of a Given Number.

Here you will find an algorithm and program in Java programming language to find factorial of a number. First let us understand what factorial means.

Explanation : The factorial of a number is the product of all the integers from 1 to that number.

For Example : Factorial of 5 is 120 i.e. 5*4*3*2*1

START
step 1 : Read the number n
step 2 : [Initialize]
         i=1, fact=1
step 3 : Repeat step 4 through 6 until i=n
step 4 : fact=fact*i
step 5 : i=i+1
step 6 : Print fact
STOP

Java Program to Find Factorial of a Number

public class LFC {
  public static void main(String[] args) 
  {
    int num = 7;
    long factorial = 1;
    for(int i = 1; i <= num; ++i)
    {
      // factorial = factorial * i;
      factorial *= i;
    }
    System.out.printf("Factorial of %d = %d", num, factorial);
  }
}

Output

Factorial of 7 = 5040