102 lines
2.1 KiB
Go
102 lines
2.1 KiB
Go
// For more tutorials: https://blog.learngoprogramming.com
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//
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// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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package main
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import (
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"fmt"
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"strings"
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)
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func main() {
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// There are 3 request totals per day
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const N = 3
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// DAILY REQUESTS DATA (PER 8-HOUR)
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reqs := []int{
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500, 600, 250, // 1st day: 1350 requests
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200, 400, 50, // 2nd day: 650 requests
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900, 800, 600, // 3rd day: 2300 requests
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750, 250, 100, // 4th day: 1100 requests
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// grand total: 5400 requests
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}
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// ALSO TRY IT WITH THIS DATA:
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// reqs = []int{
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// 500, 600, 250,
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// 200, 400, 50,
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// 900, 800, 600,
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// 750, 250, 100,
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// 150, 654, 235,
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// 320, 534, 765,
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// 121, 876, 285,
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// 543, 642,
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// }
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// ================================================
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// Allocate a slice efficiently with the exact size needed.
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//
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// Find the `size` automatically using the `reqs` slice.
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// Do not type it manually.
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//
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l := len(reqs)
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size := l / N
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if l%N != 0 {
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size++
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}
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daily := make([][]int, 0, size)
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//
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// ================================================
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// ================================================
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// Group the `reqs` per day into the slice: `daily`.
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//
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// So the daily will be:
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// [
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// [500, 600, 250]
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// [200, 400, 50]
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// [900, 800, 600]
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// [750, 250, 100]
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// ]
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//
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for N <= len(reqs) {
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daily = append(daily, reqs[:N]) // append the daily requests
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reqs = reqs[N:] // move the slice pointer for the next day
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}
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// add the residual data
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if len(reqs) > 0 {
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daily = append(daily, reqs)
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}
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// ================================================
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// ================================================
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// Print the header
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fmt.Printf("%-10s%-10s\n", "Day", "Requests")
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fmt.Println(strings.Repeat("=", 20))
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// Print the data per day along with the totals
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var grand int
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for i, day := range daily {
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var sum int
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for _, req := range day {
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sum += req
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fmt.Printf("%-10d%-10d\n", i+1, req)
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}
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fmt.Printf("%9s %-10d\n\n", "TOTAL:", sum)
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grand += sum
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}
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fmt.Printf("%9s %-10d\n", "GRAND:", grand)
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// ================================================
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}
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