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52-fibonaci.go
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52-fibonaci.go
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package main
import (
"fmt"
"time"
"strings"
)
func fibon() func () int {
var i, j = 0, 1
return func () int {
v := i
i, j = j , i+j
return v
}
}
func fibon2() func (chan int) {
var i, j = 0, 1
return func ( c chan int) {
v := i
i, j = j , i+j
c <- v
}
}
func run_job_1(r chan string) {
var msg strings.Builder
t1 := time.Now()
f := fibon()
for i := 0 ; i < 10; i ++ {
msg.WriteString( fmt.Sprintf( "v1: fib(%d) = %d\n", i, f()) )
}
t2 := time.Now()
r <- msg.String() + "run1 done." + fmt.Sprintf(" cost time = %s\n", t2.Sub(t1))
}
func run_job_2( r chan string) {
var msg strings.Builder
ch := make(chan int)
t1 := time.Now()
f2 := fibon2()
for i := 0 ; i < 10; i ++ {
go f2(ch)
msg.WriteString(fmt.Sprintf( "v2: go routine: fib(%d) = %d\n", i, <-ch ))
}
t2 := time.Now()
r <- msg.String() + "run2 done." +fmt.Sprintf(" cost time = %s\n", t2.Sub(t1))
}
func main() {
r := make(chan string)
go run_job_1(r)
go run_job_2(r)
fmt.Println("main: \n", <- r)
fmt.Println("main: \n", <- r)
}