4! It’s always better to have idea of how to build such factorial program. The factorial of a non-negative integer n is the product of all positive integers less than or equal to n. It is denoted by n!. For the factorial n you always multiply n by (n-1)! Java program to print the factorial of the given number Java Programming Java8 Java Technologies Factorial of a positive integer n is the product of all values from n to 1. Notify me of follow-up comments by email. It’s actually avoid to compute sub problem again and again. In the above program, unlike a for loop, we have to increment the value of i inside the body of the loop. = n*(n-1)! Java Program to Find Factorial of a Number. Find Factorial of a Number. The factorial is represented by the exclamation mark (!). Moving forward, we will now write a simple Java Program for Factorial Calculation. Since the factorial of a number may be very large, the type of factorial variable is declared as unsigned long long. Good to know but not right to use for performance reason. = 5 x 5 x 4 x 3 x 2 x 1. Therefore, BigInteger is very useful and is used a lot in competitive programming. This is a Java program to find the factorial of a Number using for loop. + " the factorial of n.