Go Programming

package main
import "fmt"
func main() {
fmt.Println("Hello, World!")
}

var x int = 10
y := 20// short variable declaration

const pi = 3.14

var arr [5]int
arr[0] = 1

slice := []int{1, 2, 3}

m := make(map[string]int)
m["key"] = 1

if x > 0 {
fmt.Println("Positive")
}

switch x {
case 1:
fmt.Println("One")
default:
fmt.Println("Not One")
}

for i := 0; i < 5; i++ {
fmt.Println(i)
}for _, value := range slice {
fmt.Println(value)
}

func add(a int, b int) int {
return a + b
}

func divide(a, b int) (int, error) {
if b == 0 {
return 0, fmt.Errorf("division by zero")
}
return a / b, nil
}

type Person struct {
Name string
Age int
}p := Person{Name: "Alice", Age: 30}

type Animal interface {
Speak() string
}type Dog struct{}func (d Dog) Speak() string {
return "Woof!"
}

result, err := divide(4, 0)
if err != nil {
fmt.Println(err)
} else {
fmt.Println(result)
}

go func() {
fmt.Println("Running in a goroutine")
}()

ch := make(chan int)
go func() {
ch <- 42
}()
value := <-ch
fmt.Println(value)

import (
"fmt"
"math"
)

package yourpackage
import "testing"
func TestAdd(t *testing.T) {
got := add(1, 2)
want := 3
if got != want {
t.Errorf("got %d, want %d", got, want)
}
}

go test

go build

go run main.go

go get package-name