122 lines
2.6 KiB
Go
122 lines
2.6 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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// The names of your best three friends
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names := [3]string{
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"Einstein",
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"Tesla",
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"Shepard",
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}
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// The distances to five different locations
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distances := [5]int{50, 40, 75, 30, 125}
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// A data buffer with five bytes of capacity
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data := [5]byte{'H', 'E', 'L', 'L', 'O'}
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// Currency exchange ratios only for a single currency
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ratios := [1]float64{3.14145}
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// Up/Down status of four different web servers
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alives := [4]bool{true, false, true, false}
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// A byte array that doesn't occupy memory space
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//
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// Don't do this:
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// zero := [0]byte{}
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//
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// Do this (when you don't assign elements):
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var zero [0]byte
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// =========================================================================
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separator := "\n" + strings.Repeat("=", 20) + "\n"
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fmt.Print("names", separator)
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for i := 0; i < len(names); i++ {
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fmt.Printf("names[%d]: %q\n", i, names[i])
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}
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fmt.Print("\ndistances", separator)
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for i := 0; i < len(distances); i++ {
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fmt.Printf("distances[%d]: %d\n", i, distances[i])
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}
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fmt.Print("\ndata", separator)
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for i := 0; i < len(data); i++ {
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// try the %c verb
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fmt.Printf("data[%d]: %d\n", i, data[i])
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}
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fmt.Print("\nratios", separator)
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for i := 0; i < len(ratios); i++ {
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fmt.Printf("ratios[%d]: %.2f\n", i, ratios[i])
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}
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fmt.Print("\nalives", separator)
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for i := 0; i < len(alives); i++ {
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fmt.Printf("alives[%d]: %t\n", i, alives[i])
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}
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// no loop for zero elements
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fmt.Print("\nzero", separator)
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for i := 0; i < len(zero); i++ {
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fmt.Printf("zero[%d]: %d\n", i, zero[i])
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}
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// =========================================================================
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// you know how this works :) don't be freaked out!
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fmt.Printf(`
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%s
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FOR RANGES
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%[1]s
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`, strings.Repeat("~", 30))
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fmt.Print("names", separator)
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for i, v := range names {
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fmt.Printf("names[%d]: %q\n", i, v)
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}
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fmt.Print("\ndistances", separator)
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for i, v := range distances {
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fmt.Printf("distances[%d]: %d\n", i, v)
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}
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fmt.Print("\ndata", separator)
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for i, v := range data {
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// try the %c verb
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fmt.Printf("data[%d]: %d\n", i, v)
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}
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fmt.Print("\nratios", separator)
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for i, v := range ratios {
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fmt.Printf("ratios[%d]: %.2f\n", i, v)
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}
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fmt.Print("\nalives", separator)
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for i, v := range alives {
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fmt.Printf("alives[%d]: %t\n", i, v)
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}
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// no loop for zero elements
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fmt.Print("\nzero", separator)
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for i, v := range zero {
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fmt.Printf("zero[%d]: %d\n", i, v)
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}
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}
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