added golang

fibonacci.go

@@ -0,0 +1,76 @@
+package main
+
+import (
+        "flag"
+        "fmt"
+        "strconv"
+)
+
+var max int
+var ch chan int
+
+func fib(a, b int) {
+//func fib(a, b int, bag []int) {
+  //append(bag, a)
+  ch <- a
+  //fmt.Println(a)
+
+  if b > max {
+    ch <- b
+    //append(bag, b)
+    //fmt.Println(b)
+  } else {
+    fib(b, a + b)
+  }
+}
+
+func fibloop() {
+  a, b := 1, 1
+
+  ch <- a
+  ch <- b
+  //fmt.Println(a)
+  //fmt.Println(b)
+
+  for b < max {
+    a, b = b, a + b
+    ch <- b
+    //fmt.Println(b)
+  }
+}
+
+func printStuff() {
+  for {
+    i := <-ch
+    fmt.Println(i)
+  }
+}
+
+func main() {
+  flag.Parse()
+  
+  var e error
+  ch = make(chan int)
+
+  go printStuff()
+
+  // stop counting once we get over 100 (or a user-set max)
+  if 0 == flag.NArg() {
+    max = 100
+  } else {
+    max, e = strconv.Atoi(flag.Args()[0])
+  }
+
+  if nil != e {
+    fmt.Println("argument must be an integer")
+    return
+  }
+  
+  fmt.Println("recursively...")
+  fib(1, 1)
+
+  fmt.Println("")
+
+  fmt.Println("iteratively...")
+  fibloop()
+}

fibonacci.tour.go

@@ -0,0 +1,21 @@
+package main
+
+import "fmt"
+
+// fibonacci is a function that returns
+// a function that returns an int.
+func fibonacci() func() int {
+  a := 0
+  b := 1
+  return func () int {
+    a, b = b, a + b;
+    return a;
+  }
+}
+
+func main() {
+  f := fibonacci()
+  for i := 0; i < 10; i++ {
+    fmt.Println(f())
+  }
+}