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## recursivefactorial
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### Instructions
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Écrire une fonction **récursive** qui renvoie la factorielle d'un `int` passé en paramètre.
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Les erreurs (valeurs non possibles ou overflows) renverront `0`.
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`for` est **interdit** pour cet exercice.
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### Fonction attendue
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```go
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func RecursiveFactorial(nb int) int {
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}
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```
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### Utilisation
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Voici un éventuel [programme](TODO-LINK) pour tester votre fonction :
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```go
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package main
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import (
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"fmt"
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piscine ".."
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)
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func main() {
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arg := 4
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fmt.Println(piscine.RecursiveFactorial(arg))
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}
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```
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Et son résultat :
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```console
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student@ubuntu:~/[[ROOT]]/test$ go build
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student@ubuntu:~/[[ROOT]]/test$ ./test
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24
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student@ubuntu:~/[[ROOT]]/test$
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```
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