Initial commit

11-if/01-boolean-operators/01-comparison-operators/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() {
+	speed := 100 // #1
+	// speed := 10 // #2
+
+	fast := speed >= 80
+	slow := speed < 20
+
+	fmt.Printf("fast's type is %T\n", fast)
+
+	fmt.Printf("going fast? %t\n", fast)
+	fmt.Printf("going slow? %t\n", slow)
+
+	fmt.Printf("is it 100 mph? %t\n", speed == 100)
+	fmt.Printf("is it not 100 mph? %t\n", speed != 100)
+}

11-if/01-boolean-operators/02-comparison-and-assignability/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
+
+func main() {
+	var speed int
+	// speed = "100" // NOT OK
+
+	var running bool
+	// running = 50 // NOT OK
+
+	var force float64
+	// speed = force // NOT OK
+
+	_, _, _ = speed, running, force
+}

11-if/01-boolean-operators/02-comparison-and-assignability/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
+
+func main() {
+	var speed int
+	speed = 50 // OK
+
+	var running bool
+	running = true // OK
+
+	var force float64
+	speed = int(force)
+
+	_, _, _ = speed, running, force
+}

11-if/01-boolean-operators/02-comparison-and-assignability/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
+
+import (
+	"fmt"
+	"strings"
+)
+
+func main() {
+	speed := 100 // #1
+	// speed := 10 // #2
+
+	fast := speed >= 80
+	slow := speed < 20
+
+	fmt.Printf("going fast? %t\n", fast)
+	fmt.Printf("going slow? %t\n", slow)
+
+	fmt.Printf("is it 100 mph? %t\n", speed == 100)
+	fmt.Printf("is it not 100 mph? %t\n", speed != 100)
+
+	fmt.Println(strings.Repeat("-", 25))
+
+	// -------------------------
+	// #3
+	speedB := 150.5
+	faster := speedB > 100 // ok: untyped
+
+	fmt.Println("is the other car going faster?", faster)
+
+	// ERROR: Type Mismatch
+	// faster = speedB > speed
+	faster = speedB > float64(speed)
+	fmt.Println("is the other car going faster?", faster)
+
+	// #4
+	// ERROR:
+	// only numeric values are comparable with
+	// ordering operators: <, <=, >, >=
+
+	// fmt.Println(true > faster)
+}

11-if/01-boolean-operators/03-logical-operators/01-and-operator/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
+
+import "fmt"
+
+func main() {
+	// remove the comments and run
+	// i've commented the lines it's because of the warnings
+
+	// fmt.Println("true  && true  =", true && true)
+	fmt.Println("true  && false =", true && false)
+	fmt.Println("false && true  =", false && true)
+	// fmt.Println("false && false =", false && false)
+}

11-if/01-boolean-operators/03-logical-operators/01-and-operator/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
+
+import "fmt"
+
+func main() {
+	speed := 100
+	fmt.Println("within limits?",
+		speed >= 40 && speed <= 55,
+	)
+
+	speed = 20
+	fmt.Println("within limits?",
+		speed >= 40 && speed <= 55,
+		// ^- short-circuits in the first expression here
+		//    because, it becomes false
+	)
+
+	speed = 50
+	fmt.Println("within limits?",
+		speed >= 40 && speed <= 55,
+	)
+
+	// ERROR: invalid
+	// both operands should be booleans
+	// 1 && 2
+	fmt.Println(1 == 1 && 2 == 2)
+}

11-if/01-boolean-operators/03-logical-operators/02-or-operator/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
+
+import "fmt"
+
+func main() {
+	// remove the comments and run
+	// i've commented the lines it's because of the warnings
+
+	// fmt.Println("true  || true  =", true || true)
+	fmt.Println("true  || false =", true || false)
+	fmt.Println("false || true  =", false || true)
+	// fmt.Println("false || false =", false || false)
+}

11-if/01-boolean-operators/03-logical-operators/02-or-operator/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
+
+import "fmt"
+
+func main() {
+	color := "red"
+
+	fmt.Println("reddish colors?",
+		// true || false => true (short-circuits)
+		color == "red" || color == "dark red",
+	)
+
+	color = "dark red"
+
+	fmt.Println("reddish colors?",
+		// false || true => true
+		color == "red" || color == "dark red",
+	)
+
+	fmt.Println("greenish colors?",
+		// false || false => false
+		color == "green" || color == "light green",
+	)
+}

11-if/01-boolean-operators/03-logical-operators/03-not-operator/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
+
+import "fmt"
+
+func main() {
+	fmt.Println(
+		"hi" == "hi" && 3 > 2,    //   true  && true  => true
+		"hi" != "hi" || 3 > 2,    //   false || true  => true
+		!("hi" != "hi" || 3 > 2), // !(false || true) => false
+	)
+}

11-if/01-boolean-operators/03-logical-operators/03-not-operator/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
+
+import (
+	"fmt"
+)
+
+func main() {
+	var on bool
+
+	on = !on
+	fmt.Println(on)
+
+	on = !!on
+	fmt.Println(on)
+}