Factorial calculator

The Factorial of a number is the multiplication of all the numbers smaller than and equal to that number. for e.g. factorial of 5 is

!5 = 5 x 4 x 3 x 2 x 1
= 120

Also, the factorial of 0 is 1
i.e. !0 = 1
And, Factorial of 1 is also 1.
i.e. !1 = 1

This calculator takes input only up to 2 digits due to memory constraints.