about summary refs log tree commit diff stats
path: root/factorial.mu
blob: a52cb8aec68f672eeba7267e9374177bf923f677 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
# example program: compute the factorial of 5

recipe main [
  default-space:address:space <- new location:type, 30:literal
  x:number <- factorial 5:literal
  $print [result: ], x:number, [
]
]

recipe factorial [
  default-space:address:array:location <- new location:type, 30:literal
  n:number <- next-ingredient
  {
    # if n=0 return 1
    zero?:boolean <- equal n:number, 0:literal
    break-unless zero?:boolean
    reply 1:literal
  }
  # return n * factorial(n - 1)
  x:number <- subtract n:number, 1:literal
  subresult:number <- factorial x:number
  result:number <- multiply subresult:number, n:number
  reply result:number
]

# unit test
scenario factorial-test [
  run [
    1:number <- factorial 5:literal
  ]
  memory should contain [
    1 <- 120
  ]
]