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package main
// import "fmt"
import (
"bufio"
"fmt"
"os"
"strconv"
)
func main() {
arrays()
}
func arrays() {
var arr [5]int // fills with default value
arr[2] = 5
fmt.Println(arr) // properly prints whole array
arr2 := []int{1, 2, 3}
arr3 := [5]int{1, 2, 3}
fmt.Println(arr2, arr3, len(arr2))
arr2d := [][]int{{1, 2}, {10, 20}}
fmt.Println(arr2d)
bigarr := []int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
smallerArr := bigarr[:]
fmt.Println(smallerArr)
smallerArr1 := bigarr[4:]
fmt.Println(smallerArr1)
smallerArr2 := bigarr[:2]
fmt.Println(smallerArr2)
smallerArr3 := bigarr[4:6] // start index:end index
fmt.Println(smallerArr3)
var a []int = []int{1, 2, 3}
b := append(a, 4, 5, 6)
fmt.Println(b)
for k, elem := range bigarr { // equivalent to: for k := 0; k < len(bigarr); k++
fmt.Println(k, elem)
}
for _, elem := range bigarr { // equivalent to this C# code: foreach(var elem in bigarr)
fmt.Println(elem)
}
}
func loops() {
i = 0
for i < 5 {
fmt.Println(i)
i++
}
for {
if i == 8 {
break
} else if i%2 == 0 {
fmt.Println(i)
}
i++
}
for j := 0; j < 5; j++ {
fmt.Println(j)
}
}
func conditionals() {
age := 21
if driving_age := 18; age < driving_age {
fmt.Println("You cannot drive!")
} else if age < 16 {
fmt.Println("You cannot use this app!")
} else {
fmt.Println("You're good")
}
n := 5
switch n {
case 1:
fmt.Println("Very cool")
case 4:
fmt.Println("Not cool")
default:
fmt.Println("Bruh")
}
switch {
case n > 3:
fmt.Println("Yay")
default:
fmt.Println("Nay")
}
}
func input() {
scanner := bufio.NewScanner(os.Stdin)
fmt.Printf("Type age: ")
scanner.Scan()
userInput := scanner.Text() // Always string, duuh
// Variable, base (binary, octal, decimal, ..), integer size (8, 16, 32, 64, ..)
// _ is an anonymous variable, so it doesn't get anywhere. Second returned variable is error
// Bitsize 0 is normal int
age, _ := strconv.ParseInt(userInput, 10, 0)
fmt.Printf("You were born in %d!", 2021-age)
}
var i int
func variablesAndPrinting() {
var msg string
msg = "Hello World!"
test := 5.98
var num int = int(test)
num += 4
num++
str := "Yoo"
var str1 = "Bruh"
//var v1, v2, v3 int = 45, 2342, 6634
//v4, v5, v6 = 6653, true, "nafd"
fmt.Println(msg, num) // Prints both with space in between
fmt.Print(str, str1)
fmt.Println()
/* %T - type
* %v - value
* %% - escape % character
* %t - prints bool
* %b, %o, %d, %x - format int as base 2, 8, 10 and 16 repsectively
* %e, %f, %g - format float as scientific notation, decimal no exponent (cuts of number) or large exponent (full number) respectively
* %f - default width, default precision; %9f - width of 9, default precision; %.2f - default width, precision 2; %9.f - width of 9, precision 0; %9.2f - width of 9, precision 2;
- width forces certain string length (use negative number to add spaces to the right), it works with %s and %q also (%-9q)
* %d - pads a number with a given digit, so %07d with force width of 7 and add 0s to the number
* %s, %q - show string or show string with quotes
*/
fmt.Printf("%T", num) // Prints type
out := fmt.Sprintf("%v %b", str, num)
fmt.Println(out)
}
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