Groovy example source code file (recursive.groovy)

This example Groovy source code file (recursive.groovy) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Groovy tags/keywords

ack, ack, fib, fib, tak, tak

The Groovy recursive.groovy source code

/* The Computer Language Benchmarks Game
   http://shootout.alioth.debian.org/
   contributed by Anthony Borla
   modified by Isaac Gouy
*/

def ack(x, y) {
  if (x == 0) return y+1
  if (y == 0) return ack(x-1,1)
  return ack(x-1, ack(x,y-1))
}

def fib(int n){
  if (n < 2) return 1
  return fib(n-2) + fib(n-1)
}

def fib(double n){
  if (n < 2.0D) return 1.0D
  return fib(n -2.0D) + fib(n-1.0D)
}


def tak(int x, int y, int z) {
  if (y < x) return tak(tak(x-1,y,z), tak(y-1,z,x), tak(z-1,x,y))
  return z
}

def tak(double x, double y, double z) {
  if (y < x) return tak(tak(x-1.0D,y,z), tak(y-1.0D,z,x), tak(z-1.0D,x,y))
  return z
}


def n = Integer.parseInt(args[0])

printf("Ack(3,%d): %d\n", n, ack(3,n))
printf("Fib(%.1f): %.1f\n", 27.0D + n, fib(27.0D+n))
n -= 1
printf("Tak(%d,%d,%d): %d\n", n * 3, n * 2, n, tak(n*3,n*2,n))
printf("Fib(3): %d\n", fib(3)) 
printf("Tak(3.0,2.0,1.0): %.1f\n", tak(3.0D,2.0D,1.0D))