1 files changed, 67 insertions, 0 deletions
diff --git a/week05/Exercise4.cpp b/week05/Exercise4.cpp
new file mode 100644
index 0000000..6fbb5f6
--- /dev/null
+++ b/week05/Exercise4.cpp
@@ -0,0 +1,67 @@
+struct Receipt {
+private:
+	float* prices;
+	unsigned allocated;
+	unsigned size;
+
+	void resize() {
+		allocated *= 2;
+		float* morePrices = new float[allocated];
+		for (int i = 0; i < size; i++) {
+			morePrices[i] = prices[i];
+		}
+		delete[] prices;
+		prices = morePrices;
+	}
+
+	void free() {
+		delete[] prices;
+	}
+	void copyFrom(const Receipt& other) {
+		this->allocated = other.allocated;
+		this->size = other.size;
+
+		this->prices = new float[allocated];
+		for (int i = 0; i < size; i++) {
+			this->prices[i] = other.prices[i];
+		}
+	}
+
+public:
+	Receipt() {
+		allocated = 2;
+		size = 0;
+		prices = new float[allocated];
+	}
+	~Receipt() {
+		free();
+	}
+	Receipt(const Receipt& other) {
+		copyFrom(other);
+	}
+	Receipt& operator=(const Receipt& other) {
+		if (this != &other) {
+			free();
+			copyFrom(other);
+		}
+		return *this;
+	}
+
+	void AddItemPrice(float price) {
+		if (price < 0.0) return;
+
+		if (this->allocated == this->size) {
+			resize();
+		}
+		this->prices[size++] = price;
+	}
+
+	void RemoveItemPrice(unsigned index) {
+		if (index >= size) return;
+
+		size--;
+		for (int i = index; i < size; i++) {
+			this->prices[i] = this->prices[i+1];
+		}
+	}
+};