C++ examples for STL:vector
Storing student names and grades in two vectors
#include <iostream> #include <iomanip> #include <cctype> #include <vector> #include <string> using std::string; int main(){/* w w w. ja v a2 s. c o m*/ std::vector<string> names; std::vector<double> grades; double average_grade {}; char answer {}; string name; int max_length {}; double grade {}; while(true){ std::cout << "Enter a student's name: "; std::cin >> name; names.push_back(name); if (max_length < name.length()) max_length = name.length(); std::cout << "Enter " << name << "\'s grade: "; std::cin >> grade; grades.push_back(grade); average_grade += grade; std::cout << "Do you wish to enter another student's details (y/n): "; std::cin >> answer; if (std::toupper(answer) == 'N') break; } average_grade /= grades.size(); std::cout << "\nThe class average for " << names.size() << " students is " << std::fixed << std::setprecision(2) << average_grade << std::endl; const int perline {3}; for (int i {}; i < names.size(); ++i){ std::cout << " " << std::left << std::setw(max_length) << names[i] << std::right << std::setw(6) << std::setprecision(2) << grades[i]; if ((i + 1) % perline) continue; std::cout << std::endl; } std::cout << std::endl; }