Lua Program to Find Factorial of a Number

Write a program to find factorial of a number in Lua.

For example,

Input
5
Output
120

Lua Program to Find Factorial of a Number Using Loop

function factorial(n)
	fact = 1
	for i = 1, n, 1
	do
		fact = fact * i
	end
	return fact
end

io.write("Enter a Number: ")
n = io.read("*n")
io.write("Factorial of ", n, " = ", factorial(n))

Lua Program to Find Factorial of a Number Using Recursion

function factorial(n)
	if n == 0 or n == 1 then
		return 1
	else
		return n * factorial(n - 1)
	end
end

io.write("Enter a Number: ")
n = io.read("*n")
io.write("Factorial of ", n, " = ", factorial(n))

Note

Using a loop is much more efficient than using recursion. Recursion uses an internal stack to store the information of the recursive calls. This leads to more compution and additional memory usage.