Storing student ages in dynamic array containers - C++ STL

C++ examples for STL:vector

  1. HOME
  2. C++
  3. STL
  4. vector

Description

Storing student ages in dynamic array containers

Demo Code

#include <iostream>
#include <iomanip>
#include <cctype>
#include <memory>
#include <vector>

using Class = std::vector<int>;                     // Type alias for vector storing the ages for student in a class
using PClass = std::shared_ptr<Class>;                  // Type alias for a smart pointer to a Class
using PClasses = std::vector<PClass>;                   // Type alias for a vector of pointers to Class objects

int main()/*from w w  w .  ja  v a 2 s .  c o  m*/
{
  auto pclasses = std::make_shared <PClasses>();       // Pointer to vector of pointers to Class objects
  int age {};
  PClass pclass;
  char answer {};

  while (true){
    pclass = std::make_shared<Class>();
    pclasses->push_back(pclass);

    std::cout << "Enter ages for the class, enter 0 to end:\n";
    while (true){
      std::cin >> age;
      if (!age)
         break;
      pclass->push_back(age);
    }
    std::cout << "Do you want to enter ages for another class(Y or N): ";
    std::cin >> answer;
    if (std::toupper(answer) == 'N')
       break;
  }

  const int perline {5};
  int count {};
  int class_id {};

  for (auto& pclass : *pclasses){
    count = 0;
    std::cout << "\nAges of student in class " << ++class_id << ":\n";

    for (auto age : *pclass){
      std::cout << std::setw(5) << age;
      if (++count % perline)
         continue;
      std::cout << std::endl;
    }
    std::cout << std::endl;
  }
}

Result


Related Tutorials