Question

WAP to take a number as input and find its factorial .
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Answer 1

$\textsf{\large \textbf{Factorial (n!)}}$

  $\text{It is the product of all positive numbers less than or equal to a given number.}\\\text{Denoted by the number followed by an exclamation symbol (!).}$

$\textsf{\large \textbf{Algorithm}}$

  $\text{\textemdash \:\: Accepting a number using the \textbf{Scanner} class.}\\\text{\textemdash \:\: Multiplying all positive integers less than or equal to the accepted number.}\\\text{\textemdash \:\: Printing the resulting integer.}$

Answer 2

Answer:

//Program to print the factorial of a number

package Programmer;

import java.util.*;

public class Fact{

public static void main (String ar[]){

Scanner sc=new Scanner (System.in);

System.out.print("Enter a number");

int n=sc.nextInt();

int f=1;

for(int i=1;i<=n;i++){

f *=i;

}

System.out.println("Factorial of "+n+" is "+f);

}

}

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Variable Description:-

• f:- To calculate and store factorial of a number
• n:- to accept number as Input from the user

_____

Explaination:-

• The program accepts the number from the user and stores it in variable 'n'.
• variable 'f' is initialized to 1
• Then I loop is running from 1 to n
• f gets multiplied with loop value(value of I)
• loop works till it's value is less than or equal to value of variable 'n'
• Finally loop terminates when condition is false(I<=n)
• Factorial of a number gets printed

_____

•Output Attached