Calcu und Inventory

go/01-basics/go.mod

@@ -0,0 +1,3 @@
+module gitty.informatik.th-mannheim.de/steger/pr3-sose2026/go
+
+go 1.26.0

go/01-basics/inventory.go

@@ -1,40 +1,66 @@
 package main
 
+import (
+	"fmt"
+)
+
 type Product struct {
 	Name     string
 	Price    float64
 	Quantity int
-	Category string //TODO: use enum instead
+	Category int //TODO: use enum instead
 }
 
+const(
+	Electronics int = iota
+	Groceries
+	Clothes
+)
+
 func addProduct(inventory *[]Product, name string, price float64, quantity int, category string) {
 	//TODO: implement
+	var l int = inventory.len
+	inventory = append(inventory, name, price, quantity, category)
 }
 
 func removeProduct(inventory *[]Product, name string) {
 	//TODO: implement
+	inventory = inventory.delete(name)
 }
 
 func updateQuantity(inventory *[]Product, name string, newQuantity int) {
 	//TODO: implement
+	sliceInventory[name].quantity = newQuantity;
 }
 
 func displayInventory(inventory []Product) {
 	//TODO: implement
+	for _, p := range sliceInventory{
+		fmt.Println(karte(sliceInventory[p]))
+	}
 }
 
 func main() {
 	inventory := []Product{
-		{Name: "Laptop", Price: 1000, Quantity: 5, Category: "Electronics"},
-		{Name: "Apples", Price: 2, Quantity: 50, Category: "Groceries"},
-		{Name: "T-shirt", Price: 10, Quantity: 20, Category: "Clothes"},
+		{Name: "Laptop", Price: 1000, Quantity: 5, Category: Electronics},
+		{Name: "Apples", Price: 2, Quantity: 50, Category: Groceries},
+		{Name: "T-shirt", Price: 10, Quantity: 20, Category: Clothes},
+	}
+	var arrInventory = [3]string{"Laptop", "Apples", "T-shirt"} 
+	var sliceInventory = arrInventory[:]
+
+	karte := map[string]Product{
+		"Laptop": {Name: "Laptop", Price: 1000, Quantity: 5, Category: Electronics}, 
+		"Apples": {Name: "Apples", Price: 2, Quantity: 50, Category: Groceries},
+		"T-shirt": {Name: "T-shirt", Price: 10, Quantity: 20, Category: Clothes},
+	
 	}
 
 	// Display initial inventory
 	displayInventory(inventory)
 
 	// Add a new product
-	addProduct(&inventory, "Phone", 800, 10, "Electronics")
+	addProduct(&inventory, "Phone", 800, 10, Electronics)
 
 	// Display updated inventory
 	displayInventory(inventory)

go/01-basics/maps.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+    "fmt"
+    "maps"
+)
+
+func main() {
+
+    m := make(map[string]int)
+
+    m["k1"] = 7
+    m["k2"] = 13
+
+    fmt.Println("map:", m)
+
+    v1 := m["k1"]
+    fmt.Println("v1:", v1)
+
+    v3 := m["k3"]
+    fmt.Println("v3:", v3)
+
+    fmt.Println("len:", len(m))
+
+    delete(m, "k2")
+    fmt.Println("map:", m)
+
+    clear(m)
+    fmt.Println("map:", m)
+
+    _, prs := m["k2"]
+    fmt.Println("prs:", prs)
+
+    n := map[string]int{"foo": 1, "bar": 2}
+    fmt.Println("map:", n)
+
+    n2 := map[string]int{"foo": 1, "bar": 2}
+    if maps.Equal(n, n2) {
+        fmt.Println("n == n2")
+    }
+}

go/01-basics/slices.go

@@ -0,0 +1,58 @@
+package main
+
+import (
+    "fmt"
+    "slices"
+)
+
+func main() {
+
+    var s []string
+    fmt.Println("uninit:", s, s == nil, len(s) == 0)
+
+    s = make([]string, 3)
+    fmt.Println("emp:", s, "len:", len(s), "cap:", cap(s))
+
+    s[0] = "a"
+    s[1] = "b"
+    s[2] = "c"
+    fmt.Println("set:", s)
+    fmt.Println("get:", s[2])
+
+    fmt.Println("len:", len(s))
+
+    s = append(s, "d")
+    s = append(s, "e", "f")
+    fmt.Println("apd:", s)
+
+    c := make([]string, len(s))
+    copy(c, s)
+    fmt.Println("cpy:", c)
+
+    l := s[2:5]
+    fmt.Println("sl1:", l)
+
+    l = s[:5]
+    fmt.Println("sl2:", l)
+
+    l = s[2:]
+    fmt.Println("sl3:", l)
+
+    t := []string{"g", "h", "i"}
+    fmt.Println("dcl:", t)
+
+    t2 := []string{"g", "h", "i"}
+    if slices.Equal(t, t2) {
+        fmt.Println("t == t2")
+    }
+
+    twoD := make([][]int, 3)
+    for i := range 3 {
+        innerLen := i + 1
+        twoD[i] = make([]int, innerLen)
+        for j := range innerLen {
+            twoD[i][j] = i + j
+        }
+    }
+    fmt.Println("2d: ", twoD)
+}