{{keywords>wiki library source code example reference}}
===== iscntrl =====
<code cpp>
    int iscntrl(int chr);
</code>
Tests if a character a control character

===== cpp Sourcecode Example =====
<code cpp>
#include <iostream> /* including standard library */
#include <string>
#include <cctype>

using namespace std;
int main ( void )
{
  int i;
  string str="Test\n-!&%1";
  for (i=0; i <= 11;i++)
    {
     if ( iscntrl(str[i]) != 0 )
      {
       cout << "Character " << i << " is a control char" << endl;
      }
    }
  return 0;
}
</code>
==== output ====
    Character 4 is a control char
    Character 10 is a control char
    Character 11 is a control char