adding ku material 0317

2021-oop1/ku/stream-0317/product.cpp

+#include <cstdio> // stdio.h
+#include <cstring> // string.h
+#include <vector>
+
+class Product
+{
+  private:
+
+    char name_[32];
+    int count_;
+
+    int cost_per_unit_;
+    int total_cost_;
+
+  public:
+
+    Product() = default;
+    Product(const char* name, int count, int cost_per_unit);
+
+    char* getName() { return name_; }
+    int getCount() { return count_; }
+    int getCostPerUnit() { return cost_per_unit_; }
+    int getTotalCost() { return total_cost_; }
+
+    void setName(const char* name);
+    void setCount(int count);
+    void setCostPerUnit(int cost_per_unit);
+
+    void increaseCount(int value);
+    void updateTotalCost();
+    void print();
+
+    void merge(Product& prod);
+};
+
+Product::Product(const char* name, int count, int cost_per_unit) :
+  name_(),
+  count_(count),
+  cost_per_unit_(cost_per_unit),
+  total_cost_(-1)
+{
+  strncpy(name_, name, 31);
+  name_[31] = 0;
+
+  if (count_ < 0)
+  {
+    count_ = 0;
+  }
+
+  if (cost_per_unit_ < 0)
+  {
+    cost_per_unit_ = 0;
+  }
+}
+
+void Product::setName(const char* name)
+{
+  strncpy(name_, name, 31);
+  name_[31] = 0;
+}
+
+void Product::setCount(int count)
+{
+  count_ = count;
+  if (count_ < 0)
+  {
+    count_ = 0;
+  }
+}
+
+void Product::setCostPerUnit(int cost_per_unit)
+{
+  cost_per_unit_ = cost_per_unit;
+  if (cost_per_unit_ < 0)
+  {
+    cost_per_unit_ = 0;
+  }
+}
+
+void Product::increaseCount(int increment)
+{
+  if (increment >= 1)
+    count_ += increment;
+}
+
+void Product::updateTotalCost()
+{
+  total_cost_ = cost_per_unit_ * count_;
+}
+
+void Product::print()
+{
+  printf("%s\n", name_);
+  printf("\tCount: %d  -  "
+         "Cost: %d  -  "
+         "Total Cost: %d\n", count_, cost_per_unit_, total_cost_);
+}
+
+void Product::merge(Product& prod)
+{
+  if (strcmp(name_, prod.name_) != 0)
+    return;
+
+  if (cost_per_unit_ != prod.cost_per_unit_)
+    return;
+
+  count_ += prod.count_;
+  prod.count_ = 0;
+  updateTotalCost();
+  prod.updateTotalCost();
+}
+
+
+//--------------------------------------------------------------
+// Vector added by David BEGIN
+void printShoppingList(std::vector<Product> shopping_list)
+{
+  printf("------------------\n");
+  printf("Shopping List: \n");
+  for(Product product : shopping_list)
+  {
+    product.print();
+  }
+  printf("------------------\n");
+}
+
+void goShopping()
+{
+
+  std::vector<Product> shopping_list;
+
+  Product onion("onion", 10, 2);
+  Product banana("banana", 3, 1);
+  Product beer("beer", 20, 1);
+
+  shopping_list.push_back(onion);
+  shopping_list.push_back(banana);
+  shopping_list.push_back(beer);
+
+  printShoppingList(shopping_list);
+
+  // WARNING: size() - 1 can be a problem if the shopping_list is empty
+  Product last_product = shopping_list.at(shopping_list.size() - 1);
+
+  last_product.print();
+
+  shopping_list.pop_back();
+  shopping_list.clear();
+  printShoppingList(shopping_list);
+}
+// Vector added by David END
+//--------------------------------------------------------------
+
+
+int main(void)
+{
+  Product prod;
+  prod.setName("Zwiebel");
+  prod.setCount(-2);
+  prod.setCostPerUnit(5);
+
+  printf("%s\n", prod.getName());
+  printf("\tCount: %d  -  "
+        "Cost: %d  -  "
+        "Total Cost: %d\n", prod.getCount(), prod.getCostPerUnit(), prod.getTotalCost());
+
+  printf("----------\n");
+
+  prod.increaseCount(4);
+  prod.updateTotalCost();
+  prod.print();
+
+  printf("----------\n");
+
+  Product prod2("Zwiebel", 2, 5);
+  prod2.updateTotalCost();
+  prod2.print();
+
+  printf("----------\n");
+
+  prod.merge(prod2);
+  prod.print();
+  prod2.print();
+
+  printf("----------\n");
+
+  goShopping();
+
+  return 0;
+}

2021-oop1/ku/stream-0317/vector.cpp

+//
+// program creates an int-vector and uses methods
+// to manipulate the vector
+//
+
+
+#include <cstdio>
+#include <vector>
+
+void printVector(std::vector<int> int_vector)
+{
+  printf("(size %lu)   ", int_vector.size());
+  for(int element : int_vector)
+  {
+    printf("[%d] ", element);
+  }
+  printf("\n");
+}
+
+int main()
+{
+  std::vector<int> myvector;
+  printVector(myvector);
+
+  myvector.push_back(42);
+  myvector.push_back(4);
+  printVector(myvector);
+
+  if(!myvector.empty() && myvector.at(0) == 42)
+  {
+    printf("life, the universe and everything\n");
+  }
+
+  myvector.pop_back();
+  printVector(myvector);
+
+  myvector.clear();
+  printVector(myvector);
+
+  return 0;
+}
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