Factorial Program in Java
Course- Java >
Factorial Program in Java: Factorial of n is the product of all positive descending integers. Factorial of n is denoted by n!. For example:
- 4! = 4*3*2*1 = 24
- 5! = 5*4*3*2*1 = 120
Here, 4! is pronounced as "4 factorial", it is also called "4 bang" or "4 shriek".
The factorial is normally used in Combinations and Permutations (mathematics).
There are many ways to write the factorial program in java language. Let's see the 2 ways to write the factorial program in java.
- Factorial Program using loop
- Factorial Program using recursion
Factorial Program using loop in java
Let's see the factorial Program using loop in java.
- class FactorialExample{
- public static void main(String args[]){
- int i,fact=1;
- int number=5;//It is the number to calculate factorial
- for(i=1;i<=number;i++){
- fact=fact*i;
- }
- System.out.println("Factorial of "+number+" is: "+fact);
- }
- }
Output:
Factorial of 5 is: 120
Factorial Program using recursion in java
Let's see the factorial program in java using recursion.
- class FactorialExample2{
- static int factorial(int n){
- if (n == 0)
- return 1;
- else
- return(n * factorial(n-1));
- }
- public static void main(String args[]){
- int i,fact=1;
- int number=4;//It is the number to calculate factorial
- fact = factorial(number);
- System.out.println("Factorial of "+number+" is: "+fact);
- }
- }
Output:
Factorial of 4 is: 24