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Author: yogesh-js

01hello/go.mod

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+module github.com/Aniket762/hello
+
+go 1.17

01hello/main.go

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

02variables/go.mod

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+module github.com/Aniket762/variables
+
+go 1.17

02variables/main.go

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+package main
+
+import "fmt"
+
+// when first letter is capital it is public
+// variable
+
+// defining immutable variables
+// capital L means public variable
+const LoginToken string = "awhnswhjbnshwbnsh"
+
+func main()  {
+	var username string = "Aniket762"
+	fmt.Println(username)
+	// %T for type 
+	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 = 12
+	fmt.Println(smallVal)
+	fmt.Printf("Variable is of type: %T \n",smallVal)
+
+	// default value of an int is 0
+
+	// implicit type: not defining type also works
+	var dob = 672001
+	fmt.Println(dob)
+
+	// no var style - can only be defined under a method or func
+	// := is volorous operator
+	numberOfUser := 3000
+	fmt.Println(numberOfUser) 
+}

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() {
+	a :="aloo"
+	fmt.Println(a)
+
+	reader := bufio.NewReader(os.Stdin)
+	fmt.Println("Enter")
+
+	// comma ok || err ok
+	// it's like try catch where we take
+	// the input or error or both.
+	// incase we wanna ignore one we put _
+
+	// ReadString('char') shows till when
+	// the input will read. Here when enter
+	// is pressed it will stop taking in the
+	// input
+	input , _ := reader.ReadString('\n')
+	fmt.Println("Entered val:",input)
+
+	// over here reader is a pointer
+}

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("Please rate our pizza between 1 and 5")
+
+	reader := bufio.NewReader(os.Stdin)
+	input,errors := reader.ReadString('\n')
+
+	fmt.Println("Thanks for rating, ", input)
+	// fmt.Printf("The type of rating %T,",input) // string
+	if errors != nil {
+		fmt.Println(errors)
+	}
+
+	// coverting string to number
+
+	// strings.TrimSpace is needed to remove the trailing character \n
+	numRating,errors2 := strconv.ParseFloat(strings.TrimSpace(input),64) 
+	
+	if errors2 != nil {
+		fmt.Println(errors2)
+	}
+	
+	numRating2 := numRating+1
+	fmt.Println(numRating2) 
+}

05time/go.mod

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+module times
+
+go 1.17

05time/main.go

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+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+func main()  {
+	fmt.Println("Welcome to time study of go")
+	presentTime := time.Now()
+	fmt.Println(presentTime)
+
+	// the time mentioned below is the std format as in docs
+	fmt.Println(presentTime.Format("01-02-2006 15:04:05 Monday"))
+
+	createdDate := time.Date(2021,time.November,6,21,51,10,6,time.UTC)
+	fmt.Println(createdDate)
+	fmt.Println(createdDate.Format("01-02-2006 Monday"))
+
+} 
+
+/*
+Extras:
+To build exes for different os, say I am using MAC
+i> Windows build: GOOS="windows" go build
+ii> Mac build: go build
+iii> Linux build: GOOS="linux" go build
+*/