Factorial Program In Java | By using recursion and loop

What is the factorial in java

The factorial of a positive integer is the product of all positive integers less than it and itself.need to note that the factorial of 0 is 1.we use n! to represent the factorial of an integer number n.
In other words,n!=1x2x3x4x…xn.also can use recursion to defined a factorial as 0!=1, n!=(n-1)!xn.
factorial program in java

factorial using recursion in java

Let’s write a java simple recursion program to get the factorial of given numbes from 0 to 10：

public class MainClass {
    public static void main(String args[]) {
    for (int counter = 0; counter &lt;= 10; counter++){
        System.out.printf(&quot;%d! = %d\n&quot;, counter,
        factorial(counter));
    }
    }
    public static long factorial(long number) {
        if (number &lt;= 1)
            return 1;
        else
            return number * factorial(number - 1);
    }
}

public class MainClass {

public static void main(String args[]) {

for (int counter = 0; counter <= 10; counter++){

System.out.printf("%d! = %d\n", counter,

factorial(counter));

}

public static long factorial(long number) {

if (number <= 1)

return 1;

else

return number * factorial(number - 1);

}

output

0! = 1
1! = 1
2! = 2
3! = 6
4! = 24
5! = 120
6! = 720
7! = 5040
8! = 40320
9! = 362880
10! = 3628800

0! = 1

1! = 1

2! = 2

3! = 6

4! = 24

5! = 120

6! = 720

7! = 5040

8! = 40320

9! = 362880

10! = 3628800

factorial using loop in java

public class MainClass {
    public static void main(String args[]) {
    for (int counter = 0; counter &lt;= 10; counter++){
        System.out.printf(&quot;%d! = %d\n&quot;, counter,
        factorial(counter));
    }
    }
    public static long factorial(long number) {
         int i,fact=1;
         for(i=1;i&lt;=number;i++){
            fact=fact*i;
         }
         return fact;
    }
}