Why my prog can't run correctly?
<p><img src="http://i.stack.imgur.com/E09c6.jpg" alt="alt text">// Calculate the quarters of a set of integers</p>

<pre><code>#include &lt;iostream&gt;
#include &lt;vector&gt;
#include &lt;algorithm&gt;
#include &lt;conio.h&gt;

using std::cin;
using std::cout;
using std::endl;
using std::vector;
using std::sort;

int main()
{
 // Ask for a set of integers
 cout &lt;&lt; "Please input a set of integers: "
   &lt;&lt; endl;

 // Read the set of integers
  // x is the variable to write
 int x;
  // int_set is the set of integers to write
 vector&lt;int&gt; int_set;
 while (cin &gt;&gt; x)
  {
   int_set.push_back(x);
  }

 // Check if the integer set is vacant 
 typedef std::vector&lt;int&gt;::size_type vec_sz;
 vec_sz size = int_set.size();
 if (size == 0)
  cout &lt;&lt; "There are no data. "
    &lt;&lt; "Please try again. ";

 // Sort
 sort (int_set.begin(), int_set.end());

 // The set of integers multiply 1/4
 vector&lt;double&gt; int_set_quarter;
 cout &lt;&lt; "The quarters of the set of integers are: ";
 for (int i = 0; i != size; ++i)
  {
   int_set_quarter[i] = 1/4 * int_set[i];
   cout &lt;&lt; int_set_quarter[i]; 
   cout &lt;&lt; endl;
  }

    getch();
 return 0;
}
</code></pre>

<p>If you run, then it will collapse...</p>
