go-tour

44.go

package main

import "fmt"

// fibonacci is a function that returns
// a function that returns an int.
func fibonacci() func() int {
    before := 0
    before_before := 0
    n := 0
    return func() int{
        var current int
        if n == 0{
            current = 0
        } else if n == 1 {
            current = 1
        }else{
            current = before_before + before    
        }
        before_before=before
        before=current
        
        n++
        return current
    }
}

func main() {
    f := fibonacci()
    for i := 0; i < 10; i++ {
        fmt.Println(f())
    }
}

48.go

package main

import "fmt"
import "math/cmplx"

func Cbrt(x complex128) complex128 {
    start := complex128(5)
    tmp:= start
    
    hoge := func(z complex128) complex128 {
        z = z - ( ( (z*z*z) - x ) / ( 3*z*z ) )
        return z
    }
    
    for i:=0;i<10;i++{
    tmp = hoge(tmp)
    }
    
    return tmp
}

func main() {
    var x complex128 = 7
    z := Cbrt(x)
    fmt.Println(x)
    fmt.Println(cmplx.Pow(z,3))
    fmt.Println(Cbrt(x))
    
}

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