#include <string>
#include <vector>
#include <iostream>
struct Students
{
   std::string Name;
   short testScore1, testScore2, testScore3;
};

int main()
{
   short num;

   std::cout << "Enter # of students: ";
   std::cin  >> num;

   std::vector<Students> worms(num);

   // ... rest of code
   std::cout << "the are " << worms.size() << " students in the container\n";
}