Output problem in template class

[Sam99]

Whats problem here? I am getting garbage outputs.

#include <iostream>
using namespace std;

template <class T> class vector {
    T* v;
	int default_capacity;
	int initial_capacity;
	int counter;

  public:  
	  vector()
	  {
		 default_capacity=1;
		  v = new T[default_capacity];
		  counter=1;
	  }

	  vector(int s)
	  {
		  initial_capacity=s;
		  v = new T[initial_capacity];
	  }

	  void pushBack(int element)
	  {
		if(counter <= initial_capacity){
			v[counter]=element;
			counter++;

			if(counter == initial_capacity)
				initial_capacity += 0.50;
		}
	  }

	  int size()
	  {
        return counter;
	  }

	  friend ostream &operator << (ostream &o, vector t)
	  {
		  for(int i=0; i<10; i++)
			  o<<t.v[i]<<endl;
		  return o;
	  }
};


int main()
{
	vector <int> v1;
	for(int i=0; i<10; i++){
		v1.pushBack(i);
	}

	cout<<v1<<endl;

	system ("Pause");
	return 0;
}

[MiiNiPaa]

default_capacity=1;
v = new T[default_capacity];

Will create an array of size 1

	for(int i=0; i<10; i++){
		v1.pushBack(i);
	}

You are pushing way more than its capacity. Undefined behavior, anything might happen.
initial_capacity += 0.50; this is equal to initial_capacity += 0;

[Sam99]

So what should I do?

[MiiNiPaa]

Fix it.
Rethink architecture of your vector. Hint: it will be enough to have just 3 pointer as your class data.
Your function looks like they are unfinished, so finish them.