about summary refs log blame commit diff stats
path: root/factorial.mu
blob: 8a261207866b7d6208ac5cd7955faee749688013 (plain) (tree)
1
2
3
4
5
6
7
8
9

                                             
          
             
                      
                          


 
                                   
             
                  

                     
                            
                      
            
   
                             

                              
                                 
 
 


                         
                        
   
                         


            
# example program: compute the factorial of 5

def main [
  local-scope
  x:num <- factorial 5
  $print [result: ], x, [ 
]
]

def factorial n:num -> result:num [
  local-scope
  load-ingredients
  {
    # if n=0 return 1
    zero?:bool <- equal n, 0
    break-unless zero?
    return 1
  }
  # return n * factorial(n-1)
  x:num <- subtract n, 1
  subresult:num <- factorial x
  result <- multiply subresult, n
]

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