Vector

[antu55]

hi,
im doing some exercise to understand more about vector
but when i compile the code nothing come out and there is no error in the code.
can you guys point out what is my mistake?

p/s im totally new to this language.

#include <iostream>
#include<vector>
using namespace std;

class Student {
  string name;
 public:
  void setName (string name) { this->name = name; }
  string getName() const     { return name; }
};

int main() {

  vector<Student> students;
  string name;

 for (int i = 0; i < students.size(); i++) {
    cout << "Student #" << i+1<< " : Enter name = ";
    cin >> name;
    Student student;
    student.setName(name);
    students.push_back(a);
  }

  for (int i = 0; i < students.size(); i++)
    cout << "Student #" << i+1<< " : Name = "
         << students[i].getName() << endl;

  return 0;
}

[jlb]

Your loops won't execute because students.size() is zero.

[antu55]

thanks for point it out.
will to adjust the code.

[uzferry]

I have hard time understanding what this line does:

students.push_back(a);

What exactly is a?
Shouldn't it be..
students.push_back(student); or something like that?

[keskiverto]

There is no declaration for "a", so the compiler should stop on error. Yes, pushing "student" sounds more proper.

[giblit]

If you are trying to learn vectors check out this page
http://www.cplusplus.com/reference/vector/vector/
and something to play with would be this

vector<unsigned int> vec;
    string size, error;

    do {
        error = "false";
        cout << "How many numbers would you like to input into the vector?\nSize: " << flush;
        getline(cin,size);
        for(unsigned int i = 0; i<size.size(); i++) if(isalpha(size[i])) error = "true";
    } while(error == "true");
    string nums[atoi(size.c_str())];
    do {
        error = "false";
        for(unsigned int i = 0; i<(unsigned int)atoi(size.c_str()); i++){
            cout << "Number " << i+1 << ": " << flush;
            getline(cin,nums[i]);
        }
        for(unsigned int i = 0; i<(unsigned int)atoi(size.c_str()); i++) for(unsigned int j = 0; j<nums[i].size(); j++) if(isalpha(nums[i][j])) error = "true";
    } while(error == "true");
    for(unsigned int i = 0; i<(unsigned int)atoi(size.c_str()); i++) vec.push_back((unsigned int)atoi(nums[i].c_str()));

    for(unsigned int i = 0; i<(unsigned int)vec.size(); i++) cout << vec[i] << endl;