What is "!"

Question

So i am currently doing some exercices in Java and i have this formula "S = 1 + 1!/x + 2!/x^2 + .... + N!/x^N " soo my question is what are those !-s before / ? Thanks in advance :)

Answer 1

In math ! is factorial.
5! = 1 * 2 * 3 * 4 *5
3! = 1 * 2 * 3

Answer 2

In programming the ! has another meaning. In your code it means "not". It's used to negate boolean values or to compare 2 values (!= means "is not")

To calculate the factorial you need to make a function for it where you pass the number in and get the result back. The result then gets used in the formula

Answer 3

Hint: The first part of the formula (1) is actually 0! / x^0

Answer 4

Thank you :)