I keep getting a 'no match for call to' error
<pre><code>#include &lt;iostream&gt;
#include &lt;string&gt;

using namespace std;


// Turns a digit between 1 and 9 into its english name
// Turn a number into its english name

string int_name(int n)
{

  string digit_name;
  {
    if (n == 1) return "one";
     else if (n == 2) return "two";
     else if (n == 3) return "three";
     else if (n == 4) return "four";
     else if (n == 5) return "five";
     else if (n == 6) return "six";
     else if (n == 7) return "seven";
     else if (n == 8) return "eight";
     else if (n == 9) return "nine";

    return "";
  }


  string teen_name;
  {
    if (n == 10) return "ten";
     else if (n == 11) return "eleven";
     else if (n == 12) return "twelve";
     else if (n == 13) return "thirteen";
     else if (n == 14) return "fourteen";
     else if (n == 14) return "fourteen";
     else if (n == 15) return "fifteen";
     else if (n == 16) return "sixteen";
     else if (n == 17) return "seventeen";
     else if (n == 18) return "eighteen";
     else if (n == 19) return "nineteen";

    return "";
  }


  string tens_name;
  {
    if (n == 2) return "twenty";
     else if (n == 3) return "thirty";
     else if (n == 4) return "forty";
     else if (n == 5) return "fifty";
     else if (n == 6) return "sixty";
     else if (n == 7) return "seventy";
     else if (n == 8) return "eighty";
     else if (n == 9) return "ninety";

    return "";
  }

  int c = n; // the part that still needs to be converted
  string r; // the return value

  if (c &gt;= 1000)
  {
     r = int_name(c / 1000) + " thousand";
     c = c % 1000;
  }

  if (c &gt;= 100)
  {
     r = r + " " + digit_name(c / 100) + " hundred";
     c = c % 100;
  }

  if (c &gt;= 20)
  {
     r = r + " " + tens_name(c /10);
     c = c % 10;
  }

  if (c &gt;= 10)
  {
     r = r + " " + teen_name(c);
     c = 0;
  }

  if (c &gt; 0)
     r = r + " " + digit_name(c);

  return r;
}

int main()
{
  int n;
  cout &lt;&lt; endl &lt;&lt; endl;
  cout &lt;&lt; "Please enter a positive integer: ";
  cin &gt;&gt; n;
  cout &lt;&lt; endl;
  cout &lt;&lt; int_name(n);
  cout &lt;&lt; endl &lt;&lt; endl;

  return 0;
}
</code></pre>

<p>I Keep getting this Error code:</p>

<blockquote>
  <p>intname2.cpp: In function âstd::string
  int_name(int)â:<br>
  intname2.cpp:74: error: no match for
  call to â(std::string) (int)â<br>
  intname2.cpp:80: error: no match for
  call to â(std::string) (int)â<br>
  intname2.cpp:86: error: no match for
  call to â(std::string) (int&amp;)â<br>
  intname2.cpp:91: error: no match for
  call to â(std::string) (int&amp;)â</p>
</blockquote>
