[w7] Added exercise descriptions and solutions

1 files changed, 180 insertions, 0 deletions

diff --git a/week07/Exercise5.cpp b/week07/Exercise5.cpp
new file mode 100644
index 0000000..8187771
--- /dev/null
+++ b/week07/Exercise5.cpp
@@ -0,0 +1,180 @@
+#include "Exercise5.h"
+#include <fstream>
+#include <iostream>
+#include <cstring>
+
+/* Private */
+
+void TransportTicket::free() {
+	delete[] source;
+	delete[] destination;
+}
+void TransportTicket::copyFrom(const TransportTicket& other) {
+	this->id = other.id;
+	this->source = new char[strlen(other.source)+1];
+	strcpy(this->source, other.source);
+	this->destination = new char[strlen(other.destination)+1];
+	strcpy(this->destination, other.destination);
+	this->price = other.price;
+}
+
+/* Public */
+
+TransportTicket::TransportTicket(unsigned id, const char* source, const char* destination, float price) {
+	this->id = id;
+	this->source = new char[strlen(source)+1];
+	strcpy(this->source, source);
+	this->destination = new char[strlen(destination)+1];
+	strcpy(this->destination, destination);
+	this->price = price;
+}
+void TransportTicket::Print() {
+	std::cout << id << " " << source << " " << destination << " " << price << std::endl;
+}
+
+TransportTicket::TransportTicket() {
+	id = price = 0;
+	source = destination = nullptr;
+}
+TransportTicket::~TransportTicket() {
+	free();
+}
+TransportTicket::TransportTicket(const TransportTicket& other) {
+	copyFrom(other);
+}
+TransportTicket& TransportTicket::operator=(const TransportTicket& other) {
+	if (this != &other) {
+		free();
+		copyFrom(other);
+	}
+	return *this;
+}
+TransportTicket::TransportTicket(TransportTicket&& other) {
+	this->id = other.id;
+	this->source = other.source;
+	this->destination = other.destination;
+	this->price = other.price;
+
+	other.source = nullptr;
+	other.destination = nullptr;
+}
+TransportTicket& TransportTicket::operator=(TransportTicket&& other) {
+	if (this != &other) {
+		free();
+
+		this->id = other.id;
+		this->source = other.source;
+		this->destination = other.destination;
+		this->price = other.price;
+
+		other.destination = nullptr;
+		other.source = nullptr;
+	}
+	return *this;
+}
+
+void TransportTicket::SaveText(const char* fileName) {
+	std::ofstream outFile(fileName);
+	if (!outFile.is_open()) {
+		return;
+	}
+
+	outFile << id << ',' << source << ',' << destination << ',' << price;
+	outFile.close();
+}
+
+unsigned distanceUntilComma(std::ifstream& inFile) {
+	unsigned start = inFile.tellg();
+	while (inFile.peek() != ',') {
+		inFile.get();
+	}
+	unsigned len = (unsigned)inFile.tellg() - start + 1;
+	inFile.seekg(start, std::ios::beg);
+	return len;
+}
+void TransportTicket::LoadText(const char* fileName) {
+	std::ifstream inFile(fileName);
+	if (!inFile.is_open()) {
+		return;
+	}
+
+	free();
+
+	inFile >> id;
+	inFile.ignore();
+
+	unsigned sourceLen = distanceUntilComma(inFile);
+	source = new char[sourceLen+1];
+	inFile.get(source, sourceLen);
+	source[sourceLen] = '\0';
+
+	inFile.ignore();
+
+	unsigned destinationLen = distanceUntilComma(inFile);
+	destination = new char[destinationLen+1];
+	inFile.get(destination, destinationLen);
+	destination[destinationLen] = '\0';
+
+	inFile.ignore();
+	inFile >> price;
+
+	inFile.close();
+}
+
+void TransportTicket::SaveBinary(const char* fileName) {
+	std::ofstream outFile(fileName, std::ios::binary);
+	if (!outFile.is_open()) {
+		return;
+	}
+
+	outFile.write((const char*)&id, sizeof(id));
+	outFile.write((const char*)&price, sizeof(price));
+
+	unsigned sourceLen = strlen(source)+1;
+	outFile.write((const char*)&sourceLen, sizeof(sourceLen));
+	outFile.write(source, sizeof(char) * sourceLen);
+
+	unsigned destinationLen = strlen(destination)+1;
+	outFile.write((const char*)&destinationLen, sizeof(destinationLen));
+	outFile.write(destination, sizeof(char) * destinationLen);
+
+	outFile.close();
+}
+void TransportTicket::LoadBinary(const char* fileName) {
+	std::ifstream inFile(fileName, std::ios::binary);
+	if (!inFile.is_open()) {
+		return;
+	}
+
+	free();
+
+	inFile.read((char*)&id, sizeof(id));
+	inFile.read((char*)&price, sizeof(price));
+
+	unsigned sourceLen = 0;
+	inFile.read((char*)&sourceLen, sizeof(sourceLen));
+	source = new char[sourceLen+1];
+	inFile.read(source, sizeof(char) * sourceLen);
+
+	unsigned destinationLen = 0;
+	inFile.read((char*)&destinationLen, sizeof(destinationLen));
+	destination = new char[destinationLen+1];
+	inFile.read(destination, sizeof(char) * destinationLen);
+
+	inFile.close();
+}
+
+int main() {
+	TransportTicket t1(193, "Sofia", "Bourgas", 15.50);
+	t1.SaveText("t1.txt");
+
+	TransportTicket t2(782, "Sofia", "Plovdiv", 8.99);
+	t2.SaveBinary("t2.dat");
+
+	TransportTicket t3;
+	t3.LoadText("t1.txt");
+	t3.Print();
+
+	t3.LoadBinary("t2.dat");
+	t3.Print();
+}