JAVA_Factorial( iteration & recursion )

Q. Write a program in JAVA to find factorial of a number using following techniques: a. Iteration b. Recursion 

Iteration:

import java.util.Scanner;

class fact1

{

public static void main(String args[])

{

int f=1,n,i;

Scanner sc=new Scanner(System.in);

System.out.println("enter number= ");

n=sc.nextInt();

for(i=0;i<=n;i++)

{
f=f*i;

}

System.out.println("factorial= "+f);

}

}

Output:

enter number= 5

factorial= 120

Recursion:

import java.util.Scanner;
class fact2
{
public static void main(String args[])
{
int a;
Scanner sc=new Scanner(System.in);
System.out.println("enter number= ");
a=sc.nextInt();
rec ob=new rec();
System.out.println("factorial of  "+a+"= "+ob.facto(a));
}
}
class rec
{
int facto(int n)
{
if(n==0 || n==1)
return 1;
else
return n*facto(n-1);
}

}

Output:

enter number= 5

factorial of 5= 120

/*if you have any problem, comment below*/