I tried to implement a factorial function like this:
function factorial(n)
if (n == 0) then
return 1
else
return n * factorial(n - 1)
end
end
io.write("number?")
n =io.read()
fac = factorial(n)
print("factorial of",n,"=",fac)
It works fine until I give 0 as input. It returns
lua: factorial.lua:5: stack overflow
stack traceback:
factorial.lua:5: in function 'factorial'
What am I doing wrong?
Also, It gives normal output only till 16. when I give n=17, output is 3.55687428096e+014
How to get it right?
To get "0" to work, tell read to read a number: n = io.read("*n")
To get the normal notation instead of scientific notation,use
print("factorial of",n,"=",string.format("%0f",fac))
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