Initial commit

08-numbers-and-strings/01-numbers/01-arithmetic-operators/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() {
+	// when an integer and a float value used together
+	// in an expression, the result always becomes
+	// a float value
+	fmt.Println(8 * -4.0) // -32.0 not -32
+
+	// two integer values result in an integer value
+	fmt.Println(-4 / 2)
+
+	// remainder operator
+	// it can only used with integers
+	fmt.Println(5 % 2)
+	// fmt.Println(5.0 % 2) // wrong
+
+	// addition operators
+	fmt.Println(1 + 2.5)
+	fmt.Println(2 - 3)
+
+	// negation operator
+	fmt.Println(-(-2))
+	fmt.Println(- -2) // this also works
+}

08-numbers-and-strings/01-numbers/01-arithmetic-operators/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 (
+		myAge   = 30
+		yourAge = 35
+		average float64
+	)
+
+	average = float64(myAge+yourAge) / 2
+
+	fmt.Println(average)
+}

08-numbers-and-strings/01-numbers/01-arithmetic-operators/03-float-inaccuracy/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() {
+	ratio := 1.0 / 10.0
+
+	// after 10 operations
+	// the inaccuracy is clear
+	//
+	// BTW, don't mind about this loop syntax for now
+	// I'm going to explain it afterwards
+	for range [...]int{10: 0} {
+		ratio += 1.0 / 10.0
+	}
+
+	fmt.Printf("%.60f", ratio)
+}

08-numbers-and-strings/01-numbers/01-arithmetic-operators/03-float-inaccuracy/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() {
+	// Go compiler sees these numbers as integers,
+	//   since, there are no fractional parts in
+	//   integer values,
+	// So, the result becomes 1 instead of 1.5
+
+	// So, ratio variable here is an int variable,
+	//   it's because, 3 divided by 2 results
+	//   in an integer.
+
+	ratio := 3 / 2
+
+	fmt.Printf("%d", ratio)
+}

08-numbers-and-strings/01-numbers/01-arithmetic-operators/03-float-inaccuracy/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"
+
+func main() {
+	// When you use a float value with an integer
+	// in a calculation,
+	// the result always becomes a float.
+
+	ratio := 3.0 / 2
+
+	// OR:
+	// ratio = 3 / 2.0
+
+	// OR - if 3 is inside an int variable:
+	// n := 3
+	// ratio = float64(n) / 2
+
+	fmt.Printf("%f", ratio)
+}