An sum/sub program using Golang concurrency

concurrentSum.go

package main

import "fmt"

func sum(inputs <-chan int, outputs chan<- int, num int) {
	for input := range inputs {
		num += input
		outputs <- num // something like function return in non-goroutine functions
	}
}

func main() {
	inputs := make(chan int, 1)  // inputs channel for sum goroutine
	returns := make(chan int, 1) // outputs channel of sum goroutine

	go sum(inputs, returns, 0)

	var in int        // for get input from user
	var sumStr string // sequence of numbers added together
	var out int       // for get the results from goroutine

	fmt.Printf("\u001B[H\u001B[2JEnter a number: ")
	for fmt.Scan(&in); in != 0; fmt.Scan(&in) {
		inputs <- in
		out = <-returns // something like function call in non-goroutine functions
		sumStr += fmt.Sprintf("%v \u001b[38;5;242m+\u001b[0m ", in)
		fmt.Printf("\u001B[H\u001B[2J\u001B[34m%v\u001B[0m = %v", out, sumStr)
	}
	defer close(inputs)
	defer close(returns)
	defer fmt.Printf("The result is: \u001B[34m%v\u001B[0m", out)
}

output.txt

Enter a number: 6
6 = 6 + 50
56 = 6 + 50 + 200
256 = 6 + 50 + 200 + 0
The result is: 256