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#include <iostream>
#include <fstream>
#include <cstring>
#pragma warning(disable:4996)
using namespace std;
const size_t capacity = 1024;
enum class Speciality
{
computerScience,
softwareEngineering
};
struct StudentRecord
{
char firstName[capacity];
char lastName[capacity];
char fnRaw[capacity];
//parsed by fnRaw
Speciality studentSpeciality;
int fn;
//
char email[capacity];
};
struct StudentCollection
{
StudentRecord* data;
size_t studentsCount;
};
size_t getLinesCount(ifstream& file)
{
size_t count = 0;
while (!file.eof())
{
char buff[capacity];
file.getline(buff, capacity);
count++;
}
file.seekg(0, ios::beg); //resets the stream's get position.
return count;
}
void parseField(char* dest, const char*& source)
{
while (*source != ',' && *source != '\0')
{
*dest = *source;
dest++;
source++;
}
source++;
*dest = '\0';
}
void parseFn(StudentRecord& currentStudent)
{
if (strlen(currentStudent.fnRaw) < 5)
return;
if (currentStudent.fnRaw[4] == '6')
currentStudent.studentSpeciality = Speciality::softwareEngineering;
else if (currentStudent.fnRaw[4] == '8')
currentStudent.studentSpeciality = Speciality::computerScience;
currentStudent.fn = atoi(currentStudent.fnRaw + 5);
}
void parseStudent(StudentRecord& currentStudent, const char* line)
{
parseField(currentStudent.firstName, line);
parseField(currentStudent.lastName, line);
parseField(currentStudent.fnRaw, line);
parseField(currentStudent.email, line);
parseFn(currentStudent);
}
void printStudent(const StudentRecord& st)
{
std::cout << "First name: " << st.firstName << ", second name: " << st.lastName << ", speciality: ";
if (st.studentSpeciality == Speciality::computerScience)
std::cout << "computer science, ";
else
std::cout << "software engineering, ";
std::cout << "number: " << st.fn << ", email: " << st.email << std::endl;
}
void initStudentCollection(StudentCollection& collection, const char* fileName)
{
ifstream file(fileName);
if (!file.is_open())
{
cout << "Error while reading from file!" << std::endl;
collection.studentsCount = 0;
collection.data = nullptr;
return;
}
size_t linesCount = getLinesCount(file);
size_t studentsCount = linesCount - 1;
if(studentsCount == 0)
{
return;
}
collection.data = new StudentRecord[studentsCount];
collection.studentsCount = studentsCount;
char buff[capacity];
file.getline(buff, capacity); ///skip the header
for (int i = 0; i < studentsCount; i++)
{
file.getline(buff, capacity);
parseStudent(collection.data[i], buff);
printStudent(collection.data[i]);
}
}
void saveToFile(const char* fileName, const StudentCollection& collection)
{
ofstream file(fileName);
if (!file.is_open())
return;
file << "Ime, Familiya, Fakulteten nomer, Imeyl adres" << std::endl; //header;
for (int i = 0; i < collection.studentsCount; i++)
{
file << collection.data[i].firstName << "," << collection.data[i].lastName << "," << collection.data[i].fnRaw << "," << collection.data[i].email;
bool isLast = i == collection.studentsCount - 1;
if(!isLast)
file << std::endl;
}
}
int main()
{
const char* fileName = "students.txt";
StudentCollection collection;
initStudentCollection(collection, fileName);
if(collection.studentsCount == 0)
{
std::cout << "Error! No students loaded!" << std::endl;
return -1;
}
//changes to students email
saveToFile(fileName, collection);
delete[] collection.data;
return 0;
}
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