2 files changed, 156 insertions, 0 deletions
diff --git a/Sem. 04/README.md b/Sem. 04/README.md
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Sem. 04/README.md
diff --git a/Sem. 04/uni_task(not finished).cpp b/Sem. 04/uni_task(not finished).cpp
new file mode 100644
index 0000000..bd15a2b
--- /dev/null
+++ b/Sem. 04/uni_task(not finished).cpp
@@ -0,0 +1,156 @@
+#include <iostream>
+#include <fstream>
+
+using namespace std;
+
+
+struct Student
+{
+	char* name;
+	int fn;
+	int gradesCount;
+	double averageGrade;
+};
+void print(const Student& st)
+{
+	cout << st.name << " " << st.fn << " " << st.gradesCount << " " << st.averageGrade << endl;
+}
+Student CreateStudent(const char* name, int fn, int gradesCount, double avGrade)
+{
+	Student obj;
+
+	size_t nameLen = strlen(name);
+
+	obj.name = new char[nameLen + 1];
+	strcpy(obj.name, name);
+
+	obj.fn = fn;
+	obj.gradesCount = gradesCount;
+	obj.averageGrade = avGrade;
+
+	return obj;
+}
+void saveStudentToFile(ofstream& f, const Student& st)
+{
+	size_t nameLen = strlen(st.name);
+	f.write((const char*)&nameLen, sizeof(nameLen));
+	f.write(st.name, nameLen);
+	f.write((const char*)&st.fn, sizeof(st.fn));
+	f.write((const char*)&st.gradesCount, sizeof(st.gradesCount));
+	f.write((const char*)&st.averageGrade, sizeof(st.averageGrade));
+
+}
+Student readStudentFromFile(ifstream& f)
+{
+	Student res;
+
+	size_t nameLen;
+
+	f.read((char *)&nameLen, sizeof(nameLen));
+
+	res.name = new char[nameLen + 1];
+	f.read(res.name, nameLen);
+	res.name[nameLen] = '\0';
+
+	f.read((char *)&res.fn, sizeof(res.fn));
+	f.read((char*)&res.gradesCount, sizeof(res.gradesCount));
+	f.read((char*)&res.averageGrade, sizeof(res.averageGrade));
+
+	return res;
+}
+void freeStudent(Student& s)
+{
+	delete[] s.name;
+
+	s.averageGrade = s.fn = s.gradesCount = 0;
+
+}
+
+const int UNI_NAME_MAX = 32;
+struct Uni
+{
+	char name[UNI_NAME_MAX];
+	size_t studentsCount;
+	Student* students;
+};
+
+void saveUniToFile(ofstream& f, const Uni& uni)
+{
+	
+	f.write(uni.name, sizeof(uni.name));
+	f.write((const char*)&uni.studentsCount, sizeof(uni.studentsCount));
+	
+	for (int i = 0; i < uni.studentsCount; i++)
+		saveStudentToFile(f, uni.students[i]);
+}
+
+void readUniFromFile(ifstream& f, Uni& uni)
+{
+	f.read(uni.name, sizeof(uni.name));
+	f.read((char*) &uni.studentsCount, sizeof(uni.studentsCount));
+
+	uni.students = new Student[uni.studentsCount];
+	
+	for (int i = 0; i < uni.studentsCount; i++)
+		uni.students[i] = readStudentFromFile(f);
+}
+void freeUni(Uni& uni)
+{
+	for (int i = 0; i < uni.studentsCount; i++)
+		freeStudent(uni.students[i]);
+	strcpy(uni.name, "");
+	uni.studentsCount = 0;
+}
+void print(const Uni&  u)
+{
+	cout << u.name << " " << u.studentsCount << endl;
+	for (int i = 0; i < u.studentsCount; i++)
+		print(u.students[i]);
+}
+int main()
+{
+	{ //Creating an university and saving to file
+		Uni u;
+		strcpy(u.name, "FMI");
+		u.studentsCount = 3;
+
+		u.students = new Student[u.studentsCount];
+		u.students[0] = CreateStudent("Ivan", 81234, 3, 4.5);
+		u.students[1] = CreateStudent("Angel", 12345, 4, 5);
+		u.students[2] = CreateStudent("Mariq", 81234, 5, 5.5);
+
+
+		ofstream f("uni.dat", ios::binary);
+
+		if (!f.is_open())
+		{
+			cout << "Error" << endl;
+			return -1;
+		}
+
+		saveUniToFile(f, u);
+		freeUni(u);
+	}
+
+	{ //Reading an university from file
+		
+		Uni myUni;
+		ifstream f("uni.dat", ios::binary);
+
+		if (!f.is_open())
+		{
+			cout << "Error" << endl;
+			return -1;
+		}
+
+		readUniFromFile(f, myUni);
+
+		print(myUni);
+
+		f.close();
+
+		freeUni(myUni);
+
+	}
+}
+ 
+\ No newline at end of file