Sum of squares without using a for loop in go.

main.go

package main

import "fmt"

// Global vars
var arr []int
var sos int

func check(err error) {
	if err != nil {
		panic(err)
	}
}

func recursiveSOS(t int) {
	if t == 0 {
		return
	}

	// Read no of elements in array
	var n int
	_, err := fmt.Scanf("%d", &n)
	check(err)

	// Read the array elements
	readArray(n)

	// Print sum of square (SOS)
	printSOS(n)

	// Reset the global vars
	arr = arr[:0]
	sos = 0

	// Iterate to next test case
	recursiveSOS(t-1)
}

func readArray(size int) {
	if size == 0 {
		return
	}

	var i int
	_, err := fmt.Scanf("%d", &i)
	check(err)

	arr = append(arr, i)

	readArray(size - 1)
}

func printSOS(size int) {
	if size == 0 {
		fmt.Println(sos)
		return
	}

	i := size - 1
	if arr[i] > 0 {
		sos += arr[i] * arr[i]
	}

	printSOS(size-1)
}

func main() {
	var t int
	_, err := fmt.Scanf("%d", &t)
	check(err)

	recursiveSOS(t)
}