Golang : Ackermann function example
Not really a tutorial, but just want to play with recursive function and toying with Ackermann function. Hope this example can be useful to you.
See http://en.wikipedia.org/wiki/Ackermann_function
package main
import (
"fmt"
"strconv"
"os"
)
func Ackermann(n, m int64) int64 {
// http://en.wikipedia.org/wiki/Ackermann_function
for n != 0 {
if m == 0 {
m = 1
} else {
m = Ackermann(n, m-1) // recursive
}
n = n - 1
}
return m + 1
}
func main() {
if len(os.Args) < 3 {
fmt.Println("[usage] : ackermann integer integer")
os.Exit(0)
}
// convert input (type string) to integer
first, err := strconv.ParseInt(os.Args[1], 10, 0)
if err != nil {
fmt.Println("First input parameter must be integer")
os.Exit(1)
}
second, err := strconv.ParseInt(os.Args[2], 10, 0)
if err != nil {
fmt.Println("Second input parameter must be integer")
os.Exit(1)
}
answer := Ackermann(first, second)
fmt.Println(answer)
}
Sample output :
./ackermnn 3
[usage] : ackermann integer integer
./ackermnn 3 2
29
References :
By Adam Ng
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