Welcome to the CHICKEN Scheme pasting service

(import scheme chicken foreign)

(foreign-declare "#include \"newplus/plus.c\"")

(define current-timestamp
  (foreign-lambda integer64 current_timestamp))

(define plus
  (foreign-lambda int plus int int))

(define plus-one
  (foreign-lambda int plusone int))

(define (run count)
  (let ((start (current-timestamp)))
    (let loop ((x 0))
      (when (fx< x count)
        (loop (plus-one x))))
    (print (fx- (current-timestamp) start))))

(let ((args (command-line-arguments)))
  (when (null? args)
    (print "First arg is required")
    (exit 1))
  (or (and-let* ((count (string->number (car args))))
        (when (or (< count 0)
                  (> count 2000000000))
          (print "Must be a positive number not exceeding 2 billion.")
          (exit 1))
        (run count))
      (begin
        (print "Input must be a number.")
        (exit 1))))