Challenge 3 — Solution

Task: Create a slice of ints called scores with at least 5 values.
Write a loop that calculates both the total and the average (total /
number of scores, as a proper float64 result), printing both using
Printf with %.2f.

package main

import "fmt"

func main() {
	scores := []int{88, 72, 95, 67, 81}

	total := 0
	for _, score := range scores {
		total += score
	}

	average := float64(total) / float64(len(scores))

	fmt.Printf("Total: %.2f\n", float64(total))
	fmt.Printf("Average: %.2f\n", average)
}


Expected output:

Total: 403.00
Average: 80.60

Notes:
- total is accumulated as a plain int, since all the scores are
  ints — only when calculating the average is a conversion to
  float64 actually needed, on both total and len(scores), otherwise
  the division would truncate (Chapter 3).
- %.2f always shows exactly 2 decimal places, even for a whole
  number like 403, which is why Total prints as "403.00" rather than
  just "403".
- len(scores) works on a slice exactly the same way it worked on
  arrays and strings earlier in this chapter.