What is the C plus plus program to display fname lname age and id number of 100 students and arrange their name alphabetically?

Answer 1

Create a class to represent a student:

struct student {

string fname;

string lname;

unsigned age;

unsigned id;

};

Overload operator< to compare two student objects:

bool operator< (const student& a, const student& b) {

return a.lname<b.lname;

}

Overload std::ostream::operator<< to print a student:

std::ostream& operator<< (std::ostream& os, const student& s) {

return os << s.fname << ' ' << s.lname << ' ' << s.age << ' ' << s.id;

}

Now you can write your program:

int main() {

std::vector<student> v;

for (unsigned count=0; count<100;) {

student s;

std::cout << "Enter details for student #" << ++count;

std::cout << "First name: ";

std::cin >> s.fname; std::cout << "Last name: ";

std::cin >> s.lname;

std::cout << "Age: ";

std::cin >> s.age;

std::cout << "ID: ";

std::cin >> s.id;

v.push_back (s);

}

std::cout << "Sorting..."

std::sort (v.begin(), v.end());

std::cout << "\n\n";

// Print students...

for (auto s : v) std::cout << s << std::endl;

}