Started learning go and created a basics file

1 files changed, 149 insertions, 0 deletions

diff --git a/Go/tutorial.go b/Go/tutorial.go
new file mode 100644
index 0000000..8230d13
--- /dev/null
+++ b/Go/tutorial.go
@@ -0,0 +1,149 @@
+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)
+}