add: numbers and strings exercises

08-numbers-and-strings/01-numbers/exercises/04-incdecs/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: Incdecs
+//
+//  1. Increase the `counter` 5 times
+//  2. Decrease the `factor` 2 times
+//  3. Print the product of counter and factor
+//
+// RESTRICTION
+//  Use only the incdec statements
+//
+// EXPECTED OUTPUT
+//  -75
+// ---------------------------------------------------------
+
+func main() {
+	// DO NOT TOUCH THIS
+	counter, factor := 45, 0.5
+
+	// TYPE YOUR CODE BELOW
+	// ...
+
+	// LASTLY: REMOVE THE CODE BELOW
+	_, _ = counter, factor
+}

08-numbers-and-strings/01-numbers/exercises/04-incdecs/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"
+
+func main() {
+	counter, factor := 45, 0.5
+
+	counter++
+	counter++
+	counter++
+	counter++
+	counter++
+
+	factor--
+	factor--
+
+	fmt.Println(float64(counter) * factor)
+}