Initial commit

06-variables/06-project-greeter/01-demonstration/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+// NOTE: RUN THIS WITH 3 ARGUMENTS AT LEAST
+//       OR, THERE WILL BE AN ERROR
+
+func main() {
+	fmt.Printf("%#v\n", os.Args)
+
+	// Gets an item from the os.Args string slice:
+	//     os.Args[INDEX]
+	// INDEX can be 0 or greater
+	fmt.Println("Path:", os.Args[0])
+	fmt.Println("1st argument:", os.Args[1])
+	fmt.Println("2nd argument:", os.Args[2])
+	fmt.Println("3rd argument:", os.Args[3])
+
+	// `len` function can find how many items
+	// inside a slice value
+	fmt.Println("Items inside os.Args:", len(os.Args))
+}

06-variables/06-project-greeter/02-version1/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+// Since, you didn't learn about the control flow statements yet
+// I didn't include an error detection here.
+//
+// So, if you don't pass a name and a lastname,
+// this program will fail.
+// This is intentional.
+
+func main() {
+	var name string
+
+	// assign a new value to the string variable below
+	name = os.Args[1]
+	fmt.Println("Hello great", name, "!")
+
+	// changes the name, declares the age with 85
+	name, age := "gandalf", 2019
+
+	fmt.Println("My name is", name)
+	fmt.Println("My age is", age)
+	fmt.Println("BTW, you shall pass!")
+}

06-variables/06-project-greeter/03-version2/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+// Since, you didn't learn about the control flow statements yet
+// I didn't include an error detection here.
+//
+// So, if you don't pass a name and a lastname,
+// this program will fail.
+// This is intentional.
+
+func main() {
+	// assign a new value to the string variable below
+	name := os.Args[1]
+	fmt.Println("Hello great", name, "!")
+
+	// changes the name, declares the age with 85
+	name, age := "gandalf", 2019
+
+	fmt.Println("My name is", name)
+	fmt.Println("My age is", age)
+	fmt.Println("BTW, you shall pass!")
+}

06-variables/06-project-greeter/exercises/01/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+// ---------------------------------------------------------
+// EXERCISE
+//  Print the count of the command-line arguments
+//
+// INPUT
+//  bilbo balbo bungo
+//
+// EXPECTED OUTPUT
+//  There are 3 names.
+// ---------------------------------------------------------
+
+func main() {
+	// FIX THIS CODE
+	// count := ?
+
+	// DO NOT TOUCH THIS CODE
+	// fmt.Printf("There are %d names.\n", count)
+}

06-variables/06-project-greeter/exercises/01/solution/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+func main() {
+	count := len(os.Args) - 1
+
+	fmt.Printf("There are %d names.\n", count)
+}

06-variables/06-project-greeter/exercises/02/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+// ---------------------------------------------------------
+// EXERCISE
+//  Print the path of the running program
+//  By getting it from `os.Args` variable
+//
+// HINT
+//  Use `go build` to build your program.
+//  Then run it using the compiled executable program file.
+//
+// EXPECTED OUTPUT SHOULD INCLUDE THIS
+//  myprogram
+// ---------------------------------------------------------
+
+func main() {
+}

06-variables/06-project-greeter/exercises/02/solution/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+// STEPS:
+//
+// Compile it by typing:
+//   go build -o myprogram
+//
+// Then run it by typing:
+//   ./myprogram
+//
+// If you're on Windows, then type:
+//   myprogram
+
+func main() {
+	fmt.Println(os.Args[0])
+}

06-variables/06-project-greeter/exercises/03/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+// ---------------------------------------------------------
+// EXERCISE
+//  Print your name
+//  Get it from the first command-line argument
+//
+// INPUT
+//  Call the program using your name
+//
+// EXPECTED OUTPUT
+//  It should print your name
+//
+// EXAMPLE
+//  go run main.go inanc
+//  inanc
+//
+// BONUS: Make the output like this:
+//  go run main.go inanc
+//  Hi inanc
+//  How are you?
+// ---------------------------------------------------------
+
+func main() {
+	// get your name from the command-line
+	// and print it
+}

06-variables/06-project-greeter/exercises/03/solution/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+func main() {
+	fmt.Println(os.Args[1])
+
+	// BONUS SOLUTION:
+	fmt.Println("Hello", os.Args[1])
+	fmt.Println("How are you?")
+}

06-variables/06-project-greeter/exercises/04/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+// ---------------------------------------------------------
+// EXERCISE
+//  Greet more people
+//
+// RESTRICTIONS
+//  Be sure to match to the expected output below
+//
+// INPUT
+//  bilbo balbo bungo
+//
+// EXPECTED OUTPUT
+//  There are 3 people!
+//  Hello great bilbo !
+//  Hello great balbo !
+//  Hello great bungo !
+//  Nice to meet you all.
+// ---------------------------------------------------------
+
+func main() {
+	// TYPE YOUR CODE HERE
+
+	// BONUS #1:
+	// Observe the error if you pass less then 3 arguments.
+	// Search on the web how to solve that.
+}

06-variables/06-project-greeter/exercises/04/solution/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+func main() {
+	var (
+		l  = len(os.Args) - 1
+		n1 = os.Args[1]
+		n2 = os.Args[2]
+		n3 = os.Args[3]
+	)
+
+	fmt.Println("There are", l, "people !")
+	fmt.Println("Hello great", n1, "!")
+	fmt.Println("Hello great", n2, "!")
+	fmt.Println("Hello great", n3, "!")
+	fmt.Println("Nice to meet you all.")
+}

06-variables/06-project-greeter/exercises/05/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+// ---------------------------------------------------------
+// EXERCISE
+//  Greeat 5 people this time.
+//  Do not copy paste from the previous exercise!
+//  And do not look at it.
+//
+// RESTRICTION
+//  This time do not use variables.
+//
+// INPUT
+//  bilbo balbo bungo gandalf legolas
+//
+// EXPECTED OUTPUT
+//  There are 5 people!
+//  Hello great bilbo !
+//  Hello great balbo !
+//  Hello great bungo !
+//  Hello great gandalf !
+//  Hello great legolas !
+//  Nice to meet you all.
+// ---------------------------------------------------------
+
+func main() {
+	// TYPE YOUR CODE HERE
+}

06-variables/06-project-greeter/exercises/05/solution/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+func main() {
+	fmt.Println("There are", len(os.Args)-1, "people !")
+	fmt.Println("Hello great", os.Args[1], "!")
+	fmt.Println("Hello great", os.Args[2], "!")
+	fmt.Println("Hello great", os.Args[3], "!")
+	fmt.Println("Hello great", os.Args[4], "!")
+	fmt.Println("Hello great", os.Args[5], "!")
+	fmt.Println("Nice to meet you all.")
+}

06-variables/06-project-greeter/exercises/solution-to-the-lecture-exercise/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+// ---------------------------------------------------------
+// This is a solution to the exercise that I asked
+// in the lecture.
+// ---------------------------------------------------------
+
+// NOTE: You should run this program with 3 arguments
+//       at least. Or there will be an error.
+
+func main() {
+	// assign a new value to the string variable below
+	var (
+		name  = os.Args[1]
+		name2 = os.Args[2]
+		name3 = os.Args[3]
+	)
+
+	fmt.Println("Hello great", name, "!")
+	fmt.Println("And hellooo to you magnificient", name2, "!")
+	fmt.Println("Welcome", name3, "!")
+
+	// changes the name, declares the age with 131
+	name, age := "bilbo baggins", 131 // unknown age!
+
+	fmt.Println("My name is", name)
+	fmt.Println("My age is", age)
+	fmt.Println("And, I love adventures!")
+}

06-variables/06-project-greeter/questions/questions.md

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+## What's does `os.Args` variable store in its first item?
+* The first argument that is passed to the program
+* The second argument that is passed to the program
+* Path to the running program *CORRECT*
+
+## What's the type of the `Args` variable?
+```go
+var Args []string
+```
+* string
+* string array
+* a slice of strings *CORRECT*
+
+## What is the type of each value in the `Args` variable?
+```go
+var Args []string
+```
+* string *CORRECT*
+* string array
+* a slice of strings
+
+## How to get the first item of the `Args` variable?
+```go
+var Args []string
+```
+* Args.0
+* Args{1}
+* Args[0] *CORRECT*
+* Args(1)
+
+## How to get the second item of the `Args` variable?
+```go
+var Args []string
+```
+* Args.2
+* Args[1] *CORRECT*
+* Args{1}
+* Args(2)
+
+## How to get the length of the `Args` variable?
+```go
+var Args []string
+```
+* length(Args)
+* Args.len
+* len(Args) *CORRECT*
+* Args.Length
+
+## How to get the first "argument" from the command-line?
+* os.Args[0]
+* os.Args[1] *CORRECT*
+* os.Args[2]
+* os.Args[3]
+