add: x-tba/foundations

x-tba/foundations/02-variables/01-basics/main.go

@@ -0,0 +1,43 @@
+// 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 (
+	// 	name string
+	// 	name2 string
+	// 	name3 string
+	// )
+
+	// var name, name2, name3 string
+	// name = os.Args[1]
+	// name2 = os.Args[2]
+	// name3 = os.Args[3]
+
+	// name := os.Args[1]
+	// name2 := os.Args[2]
+	// name3 := os.Args[3]
+
+	name, name2, name3 := os.Args[1], os.Args[2], 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!")
+}

x-tba/foundations/02-variables/02-short-discard/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"
+	"math"
+	"os"
+	"path"
+	"strconv"
+)
+
+func main() {
+	var radius, area float64
+
+	radius, _ = strconv.ParseFloat(os.Args[1], 64)
+
+	area = 4 * math.Pi * math.Pow(radius, 2)
+	// area := 4 * math.Pi * math.Pow(radius, 2)
+
+	fmt.Printf("radius: %g -> area: %.2f\n",
+		radius, area)
+
+	dir, _ := path.Split("secret/file.txt")
+	fmt.Println(dir)
+
+	color, color2 := "red", "blue"
+	color, color2 = color2, color
+	fmt.Println(color, color2)
+}

x-tba/foundations/02-variables/03-conversion/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"
+
+func main() {
+	min := int8(127)
+	max := int16(1000)
+
+	fmt.Println(max + int16(min))
+
+	// EXPLANATION
+	//
+	// `int8(max)` destroys the information of max
+	// It reduces it to 127
+	// Which is the maximum value of int8
+	//
+	// Correct conversion is int16(min)
+	// Because, int16 > int8
+	// When you do so, min doesn't lose information
+	//
+	// You will learn more about this in
+	// the "Go Type System" section.
+}