CODEWITHSUNDEEP
scheme
user3947081
user3947081

Reputation: 13

Scheme function to return random number

I am trying to use random-integer from srfi-27 inside a function but it always returns the same number everytime I call it.

(use srfi-27)

(define get-n
  (random-integer 10))

(print get-n)
(print get-n)
(print (random-integer 10))
(print (random-integer 10))
(print (random-integer 10))
(print get-n)
(print get-n)

Output:

8
8
1
9
8
8
8

Can someone explain to me why this function always return to me the same number.

Additionally, how can I abstract the code for making the random number?

In the example I only ask for a number between 0 and 10 but in reality I want to do extra things to the number which is returned and I do not want to copy paste this code.

Upvotes: 1

Views: 878

Answers (1)

Barmar
Barmar

Reputation: 780994

get-n is not a function, it's just a variable that contains the result of a single call to random-integer when you assigned it. If you want it to get a new random number each time, you have to define a function, and call it as a function.

(define get-n
    (lambda() (random-integer 10)))

(print (get-n))
(print (get-n))
(print (get-n))

The above function definition syntax can be abbreviated as:

(define (get-n)
    (random-integer 10))

Upvotes: 2

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