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32 lines
522 B
Go

package main
import (
"fmt"
"runtime"
)
func main() {
numThreads := runtime.NumCPU()
fmt.Printf("I have : %d threads\n", numThreads)
ch := make(chan int)
for i := 0; i < numThreads; i++ {
go sumOf3n5Multiples(1000, numThreads, 3+i, ch)
}
j := 0
for i := 0; i < 8; i++ {
j += <-ch
}
fmt.Printf("%d", j)
}
func sumOf3n5Multiples(maxNumber int, stepSize int, start int, ch chan int) {
var sum = 0
for i := start; i < maxNumber; i += stepSize {
if i%3 == 0 || i%5 == 0 {
sum += i
}
}
ch <- sum
}