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| #include <algorithm>
#include <iostream>
#include <string>
#include <vector>
class Record {
public:
Record();
Record(const std::string &, const std::string &, double);
std::string getStudent() const;
std::string getGroup() const;
double getMark() const;
static bool compByName(const Record &, const Record &);
static bool compByGroup(const Record &, const Record &);
static bool compByMark(const Record &, const Record &);
friend std::ostream& operator<<(std::ostream &, const Record &);
friend std::istream& operator>>(std::istream &, Record &);
private:
std::string m_student;
std::string m_group;
double m_mark;
};
Record::Record()
: m_student(), m_group(), m_mark(0.0) { }
Record::Record(const std::string &student, const std::string &group, double mark)
: m_student(student), m_group(group), m_mark(mark) { }
std::string Record::getStudent() const {
return m_student;
}
std::string Record::getGroup() const {
return m_group;
}
double Record::getMark() const {
return m_mark;
}
bool Record::compByName(const Record &a, const Record &b) {
return a.m_student < b.m_student;
}
bool Record::compByGroup(const Record &a, const Record &b) {
return a.m_group < b.m_group;
}
bool Record::compByMark(const Record &a, const Record &b) {
return a.m_mark < b.m_mark;
}
std::ostream& operator<<(std::ostream &os, const Record &record) {
os << "Student: " << record.m_student << ", group: " << record.m_group
<< ". Mark: " << record.m_mark;
return os;
}
std::istream& operator>>(std::istream &is, Record &record) {
is >> record.m_student >> record.m_group >> record.m_mark;
return is;
}
int excellentsInGroup(const std::vector<Record> &array, const std::string &group) {
int excellents = -1;
for (const auto &el : array) {
if (el.getGroup() == group && el.getMark() == 5.0)
++excellents;
}
if (excellents != -1) ++excellents;
return excellents;
}
int main() {
std::size_t size = 0;
std::cout << "Please, enter the number of records: ";
std::cin >> size;
std::vector<Record> array(size);
for (std::size_t i = 0; i < size; ++i) {
std::cout << i + 1 << ". Please, enter student, group and mark: ";
std::cin >> array[i];
}
//Print
for (const auto &el : array) {
std::cout << el << '\n';
}
std::cout << "\n\nSorting...\n\n";
std::sort(array.begin(), array.end(), Record::compByName);
for (const auto &el : array) {
std::cout << el << '\n';
}
int excellents = excellentsInGroup(array, "AM-31");
if (excellents == -1) {
std::cout << "Error";
} else {
std::cout << "\nExcellent students: " << excellents << '\n';
}
system("PAUSE");
return 0;
} |
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