golang code files

Author: hiteshchoudhary

01hello/go.mod

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+module hello
+
+go 1.17

01hello/main.go

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+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("Hello from LearnCodeonline.in")
+}

02variables/go.mod

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+module variables
+
+go 1.17

02variables/main.go

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+package main
+
+import "fmt"
+
+const LoginToken string = "ghabbhhjd" // Public
+
+func main() {
+	var username string = "hitesh"
+	fmt.Println(username)
+	fmt.Printf("Variable is of type: %T \n", username)
+
+	var isLoggedIn bool = false
+	fmt.Println(isLoggedIn)
+	fmt.Printf("Variable is of type: %T \n", isLoggedIn)
+
+	var smallVal uint8 = 255
+	fmt.Println(smallVal)
+	fmt.Printf("Variable is of type: %T \n", smallVal)
+
+	var smallFloat float64 = 255.45544511254451885
+	fmt.Println(smallFloat)
+	fmt.Printf("Variable is of type: %T \n", smallFloat)
+
+	// default values and some aliases
+	var anotherVariable int
+	fmt.Println(anotherVariable)
+	fmt.Printf("Variable is of type: %T \n", anotherVariable)
+
+	// implicit type
+
+	var website = "learncodeonline.in"
+	fmt.Println(website)
+
+	// no var style
+
+	numberOfUser := 300000.0
+	fmt.Println(numberOfUser)
+
+	fmt.Println(LoginToken)
+	fmt.Printf("Variable is of type: %T \n", LoginToken)
+
+}

03userinput/go.mod

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+module userinput
+
+go 1.17

03userinput/main.go

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+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+func main() {
+	welcome := "Welcome to user input"
+	fmt.Println(welcome)
+
+	reader := bufio.NewReader(os.Stdin)
+	fmt.Println("Enter the rating for our Pizza:")
+
+	// comma ok || err err
+
+	input, _ := reader.ReadString('\n')
+	fmt.Println("Thanks for rating, ", input)
+	fmt.Printf("Type of this rating is %T", input)
+}

04conversion/go.mod

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+module conversion
+
+go 1.17

04conversion/main.go

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+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	fmt.Println("Welcome to our pizza app")
+	fmt.Println("Please rate our pizza between 1 and 5")
+
+	reader := bufio.NewReader(os.Stdin)
+
+	input, _ := reader.ReadString('\n')
+
+	fmt.Println("Thanks for rating, ", input)
+
+	numRating, err := strconv.ParseFloat(strings.TrimSpace(input), 64)
+
+	if err != nil {
+		fmt.Println(err)
+
+	} else {
+		fmt.Println("Added 1 to your rating: ", numRating+1)
+	}
+}

05mymaths/go.mod

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+module mymath
+
+go 1.17

05mymaths/main.go

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+package main
+
+import (
+	"fmt"
+	"math/big"
+
+	//"math/rand"
+	"crypto/rand"
+)
+
+func main() {
+	fmt.Println("Welcome to maths in golang")
+
+	//var mynumberOne int = 2
+	//var mynumberTwo float64 = 4.5
+
+	// fmt.Println("The sum is: ", mynumberOne+int(mynumberTwo))
+
+	//random number
+	// rand.Seed(time.Now().UnixNano())
+	// fmt.Println(rand.Intn(5) + 1)
+
+	//random from crypto
+
+	myRandomNum, _ := rand.Int(rand.Reader, big.NewInt(5))
+	fmt.Println(myRandomNum)
+
+}