Create solution.cpp

1 files changed, 169 insertions, 0 deletions

diff --git a/pract SI/week4/solution.cpp b/pract SI/week4/solution.cpp
new file mode 100644
index 0000000..5fd348d
--- /dev/null
+++ b/pract SI/week4/solution.cpp
@@ -0,0 +1,169 @@
+#include<iostream>
+#include<fstream>
+#include<cstring>
+
+struct task {
+	char* name;
+	char* problem;
+	int	  points;
+
+	task() : name(nullptr), problem(nullptr), points(0) {}
+  
+	//task() {
+	//	this->name = nullptr;
+	//	this->problem = nullptr;
+	//	this->points = 0;
+	//}
+
+	void setTaskName(const char* nName) {
+		delete[] name;						      // Изтриваме старото име за да избегнем отечка на памет
+
+		int length = strlen(nName);			// Вземаме дължината на новото име
+		name = new char[length + 1];		// Заделяме точно колкото памет ни трябва
+
+		// Еквивалентно на strcpy, просто копираме символ по символ
+		for (int i = 0; i < length; i++)
+			name[i] = nName[i];
+		name[length] = '\0';
+	}
+
+	// Аналогично с setTaskName
+	void setTaskProblem(const char* nProblem) {
+		delete[] problem;
+
+		int length = strlen(nProblem);
+		problem = new char[length + 1];
+
+		for (int i = 0; i < length; i++)
+			problem[i] = nProblem[i];
+		problem[length] = '\0';
+	}
+
+	void writeToFile(std::ofstream& outFile) const {
+		int nameLength = strlen(name);
+		int problemLength = strlen(problem);
+
+		outFile.write((const char*)&nameLength, sizeof(nameLength));
+		outFile.write(name, nameLength);
+
+		outFile.write((const char*)&problemLength, sizeof(problemLength));
+		outFile.write(problem, problemLength);
+
+		outFile.write((const char*)&points, sizeof(points));
+	}
+
+	void readFromFile(std::ifstream& inFile) {
+		int nameLength = 0;
+		int problemLength = 0;
+
+		// Какво ще стане ако не изтрием паметта?
+		delete[] name;
+		delete[] problem;
+
+		inFile.read((char*)&nameLength, sizeof(nameLength));
+		name = new char[nameLength + 1];
+		inFile.read(name, nameLength);
+		name[nameLength] = '\0';
+
+		inFile.read((char*)&problemLength, sizeof(problemLength));
+		problem = new char[problemLength + 1];
+		inFile.read(problem, problemLength);
+		problem[problemLength] = '\0';
+
+		inFile.read((char*)&points, sizeof(points));
+	}
+
+	void setPoints(int nPoints) {
+		points = nPoints;
+	}
+
+	int getPoints() const {
+		return points;
+	}
+
+	void showTask() const {
+		std::cout << "Name: " << name << std::endl <<
+			"Problem to be solved: \n" << problem <<
+			std::endl << "Points: " << points << std::endl;
+	}
+
+	~task() {
+		delete[] problem;
+		delete[] name;
+	}
+};
+
+const int TASKS_COUNT = 3;
+
+struct exam {
+	task data[TASKS_COUNT];
+	int minPoints;
+
+	exam() : minPoints(0) {}
+
+	void setMin(int nMin) {
+		// Може да си добавите и допълнителна валидация.
+		minPoints = nMin;
+	}
+
+	int getMaxPoints() const {
+		int result = 0;
+		for (int i = 0; i < TASKS_COUNT; i++)
+			result += data[i].getPoints();
+		return result;
+	}
+
+	void writeToFile(const char* filePath) const {
+		std::ofstream outFile(filePath, std::ios::binary);
+
+		if (!outFile)
+			return;
+
+		for (int i = 0; i < TASKS_COUNT; i++)
+			data[i].writeToFile(outFile);
+	}
+
+	void readFromFile(const char* filePath) {
+		std::ifstream inFile(filePath, std::ios::binary);
+
+		if (!inFile)
+			return;
+
+		for (int i = 0; i < TASKS_COUNT; i++)
+			data[i].readFromFile(inFile);
+	}
+
+	void showTasks() const {
+		for (int i = 0; i < TASKS_COUNT; i++)
+			data[i].showTask();
+	}
+};
+
+int main() {
+	exam OOP;
+
+	OOP.data[0].setTaskName("First task");
+	OOP.data[0].setTaskProblem("Easy problem");
+	OOP.data[0].setPoints(0x19);
+
+	OOP.data[1].setTaskName("Second task");
+	OOP.data[1].setTaskProblem("Another easy problem");
+	OOP.data[1].setPoints(0x19);
+
+	OOP.data[2].setTaskName("Third task");
+	OOP.data[2].setTaskProblem("Solvable problem");
+	OOP.data[2].setPoints(0x19);
+
+	OOP.setMin(0x4b);
+
+	std::cout << "What we created: " << std::endl;
+	OOP.showTasks();
+
+	// Saving to file
+	OOP.writeToFile("data.bat");
+
+	exam cloneOOP;
+	cloneOOP.readFromFile("data.bat");
+	std::cout << std::endl << "What we read: " << std::endl;
+	cloneOOP.showTasks();
+}