#include <iostream>
#include <vector>

class myClass
{
public:
    //constructor
    myClass(int i=0);
    
    void myClassFunction(){std::cout<< "I am " << m_number << '\n';}
    
    int m_number;
};

myClass::myClass(int i)
{
    m_number = i;
}

int main()
{
    std::vector<myClass> myInstances;
    for(int i = 0; i < 10; ++i) {
        myInstances.emplace_back(i);
    }
    myInstances[5].myClassFunction();
}