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fib.go
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hello.go
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life.go
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peano.go
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pi.go
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sieve.go
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Code Editor : pi.go
// Concurrent computation of pi. // See https://goo.gl/la6Kli. // // This demonstrates Go's ability to handle // large numbers of concurrent processes. // It is an unreasonable way to calculate pi. package main import ( "fmt" "math" ) func main() { fmt.Println(pi(5000)) } // pi launches n goroutines to compute an // approximation of pi. func pi(n int) float64 { ch := make(chan float64) for k := 0; k <= n; k++ { go term(ch, float64(k)) } f := 0.0 for k := 0; k <= n; k++ { f += <-ch } return f } func term(ch chan float64, k float64) { ch <- 4 * math.Pow(-1, k) / (2*k + 1) }
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