csci-350-lab1 / fib.ml

print_endline("Prints the Nth Fibonacci Number");;
print_string("Enter N: ");;

let limit = read_int();;

let rec fib = function
   | n when n < 0 -> invalid_arg "N must be a positive integer"
   | 0 -> 0
   | 1 -> 1
   | n -> fib(n - 1) + fib(n - 2)
;;

print_endline(string_of_int (fib limit));;
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