go/01-basics/calculator.go

@@ -5,46 +5,18 @@ import (
 )
 
 func main() {
-	const (
-		add      = "add"
-		subtract = "subtract"
-		multiply = "multiply"
-		divide   = "divide"
-		exit     = "exit"
-	)
 
-	fmt.Println("Welcome to the Simple Calculator!")
+	//TODO: implement according to README.md
-	for {
-		var operation string
-		fmt.Print("\nEnter operation (add, subtract, multiply, divide, exit): ")
-		fmt.Scan(&operation)
 
-		if operation == exit {
+	//the following code just demonstrates how to use fmt.Scan
-			fmt.Println("Goodbye!")
-			break
-		}
 
-		var num1, num2 float64
+	var str string
-		fmt.Print("Enter the first number: ")
+	fmt.Print("Please enter a string: ")
-		fmt.Scan(&num1)
+	fmt.Scan(&str)
-		fmt.Print("Enter the second number: ")
-		fmt.Scan(&num2)
 
-		switch operation {
+	var x float64
-		case add:
+	fmt.Print("Please enter a float: ")
-			fmt.Printf("Result: %.2f\n", num1+num2)
+	fmt.Scan(&x)
-		case subtract:
+
-			fmt.Printf("Result: %.2f\n", num1-num2)
+	fmt.Printf("You entered '%s' and %f\n", str, x)
-		case multiply:
-			fmt.Printf("Result: %.2f\n", num1*num2)
-		case divide:
-			if num2 == 0 {
-				fmt.Println("Error: Division by zero is not allowed!")
-			} else {
-				fmt.Printf("Result: %.2f\n", num1/num2)
-			}
-		default:
-			fmt.Println("Invalid operation. Please try again.")
-		}
-	}
 }

go/01-basics/slice.go

@@ -1,31 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"runtime"
-)
-
-func main() {
-	//create an array with a lot of data
-	massiveData := make([]int, 1_000_000)
-	for i := range massiveData {
-		massiveData[i] = i
-	}
-
-	// Task: Extract the first 8 elements safely
-
-	//1. attempt: use the slice operator
-	//smallSlice := massiveData[:8]
-	// consequence -> smallSlice and massiveData point to the same underlying array.
-	// Therefore, setting massiveData to nil is not sufficient to release that big array.
-
-	//2. attempt: create a new slice (with a new underlying array) and copy data
-	smallSlice := make([]int, 8)
-	copy(smallSlice, massiveData[:8])
-
-	massiveData = nil //don't use massive data anymore: Underlying array shall be freed.
-	runtime.GC()      //run the garbage collector to make sure that all unused data is actually freed
-
-	//cap(smallSlice) should be 8 or similar, but not close to 1_000_000. The majority of the data should have been released by now
-	fmt.Printf("Small Slice: %v, Len: %d, Cap: %d\n", smallSlice, len(smallSlice), cap(smallSlice))
-}

go/exercises/inventory/inventory.go

@@ -17,7 +17,7 @@ type Product struct {
 	price     float32
 }
 
-var initial_inventory = [1]Product{{ELECTRONICS, "Laptop", 10, 100.0}} //Subtask 2 => Did you mean "product(s)" instead of "product names"?
+var initial_inventory = [1]Product{{ELECTRONICS, "Laptop", 10, 100.0}} //Subtask 2 => Did you mean "product(s)" instead of "product names"
 var inventory = initial_inventory[0:]                                  //Subtask 3
 
 var product_categories = map[prod_category]string{
@@ -53,8 +53,8 @@ func DisplayInventory() {
 	fmt.Println("Kategorie:   |Name:   |Preis:   |Menge: |")
 
 	for i := 0; i < len(inventory); i++ {
-
+		product := inventory[i]
-		fmt.Printf("%s | %s | %.2f | %.2f |\n", product_categories[inventory[i].category], inventory[i].name, inventory[i].price, inventory[i].quantitiy)
+		fmt.Printf("%s | %s | %.2f | %.2f |\n", product_categories[product.category], product.name, product.price, product.quantitiy)
 	}
 	fmt.Println()
 }