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// In Go, _variables_ are explicitly declared and used by
// the compiler to e.g. check type-correctness of function
// calls.

package main

import "fmt"

func main() {

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// Go supports _constants_ of character, string, boolean,
// and numeric values.

package main

import (
	"fmt"
)

// `const` declares a constant value.

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package main

import "fmt"

func main() {
	var i int
	var f float64
	var b bool
	var s string
	fmt.Printf("%v %v %v %q\n", i, f, b, s)

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for i := 0; i <= 10; i++ {
	fmt.Println(i)
}

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i := 0
for i <= 10 {
	fmt.Println(i)
	i += 1
}

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for {
	fmt.Println("Infinite loop!")
	break // use the break keyword to stop your infinite loop
}

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// `for` is Go's only looping construct. Here are
// some basic types of `for` loops.

package main

import "fmt"

func main() {

	// The most basic type, with a single condition.

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if 15%2 === 0 {
	fmt.Println("15 is even")
} else {
	fmt.Println("15 is odd")
}

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// Branching with `if` and `else` in Go is
// straight-forward.

package main

import "fmt"

func main() {

	// Here's a basic example.

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fmt.Print("Go is running on ")
switch os := runtime.GOOS; os {
	case "darwin":
		fmt.Println("OS X.")
	case "linux":
		fmt.Println("Linux.")
	default:
		fmt.Printf("%s.\\n", os)
}