Golang Channels

Sum_Channels.go

package main

import "fmt"

func sum(s []int, c chan int) {
	sum := 0
	for _, v := range s {
		sum += v
	}
	c <- sum // send sum to c
}

func main() {
	numbers := []int{1,7, 2, 8, -9, 4, 0,11,-17,4,1,1,-23,15,2,-32,4,8,15,28,3} // an odd number of integers to sum
	
	var(
		threads,start,end int
	)
	var isOdd bool
	if len(numbers)%2 == 1{
		isOdd = true
	}
	threads = len(numbers)/5
	c := make(chan int)
	
	for i := 0; i < threads; i++ {
		start = i * 5
		end = start + 5
		if i+1 == threads && isOdd {
			end++
		}
		go sum(numbers[i*5:end],c)
	}
	
	var sum int
	for i := 0; i < threads; i++{
		val := <-c
		sum = sum + int(val)
	}
	

	fmt.Println(sum)
}